This meme is a typical straw man argument. A man could do plenty of very honorable things in his life. That would not excuse inappropriate behavior.

I have had men openly judge me on my looks, my weight, make assumptions about my intellect and abilities, I've had men try to kiss me or grab me. I really REALLY hate when some man tells me to SMILE or judges what I might be doing as "not feminine." I've had employers question why I needed money and told I should get married. I'm very fortunate in that I have never been the victim of sexual violence.

I find this meme actually insulting to men. It suggests that if a man does something honorable in his life, that gives him carte blanche to conduct himself badly with impunity.

To some there is no difference to others there is. But basically bad behaviour that is framed as male accepted behaviour.
Such as Cat Calling
Bullying the weak
Rape
Basically stuff normal men would not do and would defend against if he had a backbone.
Some extend toxic behaviour to include stoicism, tribe mentality, and aggressive behaviour beyond being uncouth.

It's pretty simple. Don't be an arsehole!

Fighting in a war does not give a man the right to comment ‘look at the tits on that’ or ‘I’d give that one’ loudly about a woman as she walks past, to grab a strange girl’s backside in a club. Or, as an extreme, to murder a woman who rejects you. Or to blame the girl who rejects a boy who then goes on to commit a terrible act; ‘she should have just given him a chance’ - no, she shouldn't.

This story about a young man and his mates playing a game on WhatsApp where they rate women they have slept with: [bbc.co.uk]

Toxic masculinity is about men and boys, ‘man up’ and ‘men don’t cry’ can be harmful to small boys. And yeah, just don’t be an arsehole.

Masculinity is positive behavior. Toxic masculinity is negative behavior.

Think about the meaning of the word, "toxic".
It shouldn't be that hard to figure out.

I think being a gentleman means being courteous and kind and using biological strength to help those who might need it by carrying heavy things, opening doors, etc. There is nothing wrong with those positive things of masculinity...courage, strength, protecting the weak, elderly, children...

Toxic masculinity means anything that is hurtful to others, including themselves...a man should be able to express feelings and cry...to care...to not feel like they need to beat someone up for doing or saying something...to not insult women or men...being a bully...putting others down for fun...raping or assaulting people...

Being patriotic is not necessarily toxic, but thinking the answer to problems is war or aggression is...many kind and generous souls were lost in wars...it wouldn't have mattered if they were masculine enough or not...

[boredpanda.com]

And this is just how it harms men.

Basically it's the difference between being secure in yourself and being an insecure show boat bully dirt bag.

Not only do women now fight in the military as well, but throughout history, so have serial killers, rapists, and some of the worst human flotsam in history. There's a reason they used to sentence men to either prison or the armed forces. Fighting in a war doesn't automatically make you an honorable or complete human being.

Masculinity retains its traditional definition. "Toxic masculinity" is a feministic construct attempting to portray masculinity as a negative.

Men secure in themselves are truly gentle-men, if masculin. Those who aren’t can overcompensate to the point of toxicity. Strong men don’t need to prove it. Apparently, the weak do, often against women.

Fighting Nazi's is a most patriotic endeavor. Grabbing women by the "chooch" & bragging about it is toxic. Charles De Gaulle had to appeal to General Eisenhower to restrain his USA troops due to the mass rapes of French women. Seems American GIs thought "no" meant "yes" in French. Little known history conveniently omitted from our propaganda films. Audi Murphy excluded. He was not toxic.

Remember when Trump was recorded saying that he would sexually assault a woman, and he could get away with it because he's famous? Do you remember what the justification of that was? "It's locker room talk." Trump's statement was indicative of toxic masculinity, and the supposed support of the statement was indicative of it.

Regular masculinity is approaching a woman and initiating a conversation. Regular masculinity is saying that it's not cool to speak like that about women.

... !

I think it's all about the change in what men can provide to society. Their strength and their courage were really appreciated in the past. Technology and peacetime have reduced such a need for strength and bravery. Men need to re-train for the future but keep in mind the future might revert back to the ways of the past in a heartbeat. If that happens, Sheldon Cooper will need to turn into John Wayne mighty fast!

These days, both men and women are in the military so I don't get the reference at all... Masculinity is all well and good... In and of itself but when that masculinity is expressed at the expense of others, it is toxic... When it abuses others, its toxic... When it frightens others, its toxic... I hope you understand this

Seems to me like the Nazis would be complaining in this time period.... hmmm

Misunderstood machismo?

tox·ic
/ˈtäksik
adjective

1. poisonous.
   "the dumping of toxic waste"
   synonyms: poisonous, venomous, virulent, noxious, dangerous, destructive, harmful, unsafe, malignant, injurious, pestilential, pernicious.

When one's masculinity is used in a toxic way.

Masculinity is about being being comfortable in your manhood. Toxic masculinity is about feeling so entitled and insecure about it that anything questionable is perceived as a threat, and a reason to impose power or control.

Actual masculinity is not being attacked when people speak of toxic masculinity and quite frankly, the rage-filled response to the conversation are prime examples toxic masculinity at work. So what is toxic masculinity?

The phrase is derived from studies that focus on violent behavior perpetrated by men, and—this is key—is designed to describe not masculinity itself, but a form of gendered behavior that results when expectations of “what it means to be a man” go wrong. The Good Men Project defines it this way: Toxic masculinity is a narrow and repressive description of manhood, designating manhood as defined by violence, sex, status and aggression. It’s the cultural ideal of manliness, where strength is everything while emotions are a weakness; where sex and brutality are yardsticks by which men are measured, while supposedly “feminine” traits—which can range from emotional vulnerability to simply not being hypersexual—are the means by which your manhood is defined.

For some men, adding the word “toxic” triggers rage, so let’s also look at it through the terms of hegemonic masculinity. Hegemonic masculinity is part of a gender order theory which recognizes multiple masculinities that vary across time, culture and the individual. Hegemonic masculinity is defined as a practice that legitimizes powerful men's dominant position in society and justifies the subordination of the common male population and women, and other marginalized ways of being a man. Hegemonic masculinity also includes a gender hierarchy and the psycho-social dynamics of the varieties of masculinity.

In contemporary American and European culture, hegemonic masculinity serves as the standard upon which the "real man" is defined. According to R. W. Connell, contemporary hegemonic masculinity is built on two legs, domination of women and a hierarchy of intermale dominance. It is also shaped to a significant extent by the stigmatization of homosexuality. Hegemonic masculinity is the stereotypic notion of masculinity that shapes the socialization and aspirations of young males. Today’s hegemonic masculinity in the United States of America and Europe includes a high degree of ruthless competition, an inability to express emotions other than anger, an unwillingness to admit weakness or dependency, devaluation of women and all feminine attributes in men, and homophobia.

And yes, I can provide the studies if you would like to read them.

Good point ?

I believe a character with masculinity would be something like superman, while one with toxic masculinity would be Superman after Lex Luthor inserted trump's brain into his head. I could hear it now,

"Aren't I great?" - You didn't do anything but play golf all week. "But I played the greatest golf, didn't I?"
'

They did, nobody cared.

I always wonder about commercials such as the following, but this one is well done and it just came out yesterday