For me they are all big deal breakers,

Hard core conservatives who are sexist, racist, classist, etc. Arrogant and intrusive. Quick to find fault and slow to praise. Power trippers. Those who are patronizing and condescending.

Ok. Am only listing piddly, semi-nit-picky things right? Bad hygiene, smoker, talks during movies, doesn't like cats, likes gory/slasher/horror movies, too femmie (or too butch) , funny sounding voice, doesn't like to exercise, bad diet, too many piercings or tats. Could come up with more but, as annoying as many are, with some work could PROBABLY get over most of these.

Unable to be sensitive or sensible or to discuss a problem

As you did not specify these major issues: I would not tolerate the following:

One who considers faith (the foundation of religion), based superstitions superior to actual facts. i.e. the religious.

Trump supporter,
Evolution denier,
Climate change denier,
Flat Earther,
Anti-Vaccer - - the list goes on - -

In short - anyone who does not display a rational understanding of the world or displays a lack of mental aptitude.

Ok I’m going to omit the obvious racist, homophobic, even differences in politics. My pet peeves are jealousy, airhead, push overs, always want to argue and devoutly religious. And she must demand a clean house. I can’t date or be with a messy woman. Because I’m messy and I need a woman the will keep my ass straight about keeping a clean house. Lol

Racism. Extreme leftist or extreme rightist. Religious. Non-affectionate. Non-communicative. Couch potato. Television junkie. Smoker. Heavy drinker. Drug user. Dishonest. Evasive.

Must have sense of humor and be difficult to offend!

I have loads, I guess, superficial people tops the list

I don't roll that way. I know a deal breaker when I see it, in vivo, and not before. Everything's situational. Everything depends. Due process reigns supreme.

If she smokes, no way

Monogamists, Consumer fetishists, Career mindedness, Timidity, Spinelessness.

I have a couple, that are pretty big for me: Listens to country music... likes Ayn Rand... Is into pseudo science... And how they treat customer service people.

Cigarettes, meat consumption, calling their ex bad names, lack of basic etiquette.

Bad teeth, I once had a friend who was so lovely but I couldn't get past the bad teeth

Someone who uses "all inclusive" phrasing and defends such phrases as "truth". Phrases like, "all christians, muslims etc are..", "all men/women are...", "all white people are responsible for the genocide of my people (my people are indigenous North Americans) ". These type of phrases are divisive and nonsensical. I cannot have a decent conversation with folks like this and conversation is an ESSENTIAL ingredient in any relationship that I participate in.

High fiving in public

Trump lover. Dog hater. Constant complaining. Racist. Rude to people, especially waiters. Doesn't think I'm hilarious. Physically unaffectionate (over time; does not have to be immediate)

Boy, I'm picky.

The only 2 dealbreakers for me are fanatical religious and fanatical Republicans

I can handle unfaithful dishonest and self obsessed even a little abuse doesn't hurt too much but the rewards are great. you have to stab me in the heart literally to get me to break the deal

Bad taste in music, likes the Kardashians, or doesn't appreciate art....all deal breakers

tobacco smoking, poor hygiene, poor grammar/communication, braggart, bigot, self-absorbed, greedy, doesn't like animals, anti-social

Disrespect

Bad hygeine, serious alcoholics, and smokers. I guess depending on how well the connection is I can MAYBE overlook smoking, but it has to be ONE HELL OF a connection to rule all loves, and when they smoke they better do it outside and away from me......and keep their breath fresh all the time. Being controlling or nagging or being a big worrier. I already have a mother lol

Cigarette smoking, having or wanting children, actively disliking Doctor Who (mainly because it's absolutely everywhere in my home and they'd be miserable/infuriated/etc), not being at least somewhat active.

Lacking a genuine love for truth, in the scientist-at-heart kind of way, is a deal breaker.