If we are talking about first impressions, then I think it is difficult not to. However, for me the sound of a persons voice is much more indicative of their character.

I would distinguish gut feeling and judgment. When I see someone, I experience feelings which may be strong or vague apprehension, delight, dislike, approval, attraction etc. However, if there is any communication between us, I have learned to adopt a nutral "business" like approach because I do not want my gut feeings to determine my attitude towards the person. Of course the occasion would also impact on my overall attitude. In general, I practice not to allow any negative "vibes" I have about someone to determine how I treat him/her.

Everyone takes an initial first impression of everyone else in order to asses potential danger, it is a survival instinct.
However once interaction takes place a deeper assesment is made based on personal preferences, social norms, compatibillity of opinions and threat assesments.

Like me, you have asemetrical nostrils...
it sounds like you’re asking a simple question, but it’s far more complex than appearance

Perhaps we are hardwired from birth - [newscientist.com]

A hardwiring reinforced by experience and learning received as the skewed data base is built in the developing brain. Given the propensity for much of the world to commence religious indoctrination from an early age and how that biases belief ...

No. If you couldn't do snap judgements, you might not be alive. Ignoring your instincts is never wise.

If you see some slovenly dressed, mean-faced guy with scars on his face hanging out in an alley and he calls you to come over, better keep walking, or quickly go into a store.

Yes, if you talk to them enough.

Only by shutting your eyes and ears

From green tomatoes to brown snakes to potential mates, we're inherently programmed to assess things on visual and initial appearances.

This is millions of years of evolution at work.

Add on a layer of cognitive, behavioral, and social biases and you're always going to make judgments.

Actual contact may change that perception, but initial biases are going to be there.

For me it depends on the context in which I meet them. I recently met a retired police officer and I met him through couch surfing so he welcomed his home to me. The first night me and a few friends went out to a hotspring with him and had a great time. Before I went into his home I had no idea his former profession and not that I'm some criminal but I get uneasy around police and didn't know any personally. Being a gentle and funny man he really changed my perception. I looked at him later and if I had known what he was before I met him I would have judged him from the start in a negative and unfair way. So the context in which I meet people can really shift my perception.

Social scientist suggests the we are all biased by appearances. Consider the Baby-face Bias for one. But knowing this we can all take actions to minimize those influences. That’s one of the good arguments against including any photos on a job application. And that is why many organizations do “blind” interviews; musical auditions are often done behind screens to hide the gender and appearance of the performer.

Is it possible that there is a nerve that causes aggression that runs through the jawline? I remember Harvard Uni saying this...

Anyway, appearance is a heuristic. For example, I don't try to get people with very fit bodies to lounge around, and so on. Sometimes people are purely determined by their intentions, and it's a waste of time to try to suppose about unknowable things. Trying to mistake people, however, only looks intelligent to people who are already definitely intelligent.

I make assessments, if I think someone is tall or short for instence. There is never any judgement based on appearance as to what they are like as people. Some of the wealthiest people I have met dress like bums.

Everybody judges people as its natural but I wouldn't on looks alone.

Unfortunately, no. But I work to move past the initial judgement once I learn more.

I judge people by their attire at times..it can give you an idea of their personality..

Judge them how???..if they are way over weight, I will imagine they don't do well in a quarter mile sprint, if they very skinny, chances are they cannot lift alot of weight. if they are short, they cannot reach tall things....whats wrong with that...facts are facts.

We all make judgements based on all sorts of things, including appearance, mannerisms, what music the person is listening to, gait, and more. Whether or not one draws conclusions about the person prematurely based on those observations and judgements is really the issue. I think some of us tend to do so, while others do not. I would like to think I am part of the latter group.

Hmmm... I try my best not to judge people on looks. I think it is part of the overall package yet as I left my 20's I found I was much happier with women who I judged on compassion and intelligence primarily and looks secondarily.

In high school I hung out with the football players and quite a few gave me grief for dating a girl they felt wasn't beautiful... She was kind, smart and I thought she was beautiful so I ignored them.

For me, it depends. Having been through a lot of abuse (both physical and emotional) at the hands of people that met a certain body type, I tend to shy away from people that are a lot bigger than I am (and no, it's not a weight thing, or a gender thing - I'm just more comfortable around smaller people). Still, I try to not judge, or expect the worst, but there are a few things that I do find difficult to digest. For example, even homeless folks (who are dealing with a horrible situation) can usually find a public restroom, or some place to wash up at least a little. As for every one else, there is no excuse to be filthy all the time.
The ones I find myself struggling with the most are the people that dress for the 'holier than thou' lifestyle. While I have occasionally been surprised, I find these folks usually fit the part, so I avoid them when I can.

Another, it depends answer. At my stage of life I wouldn't expect a playboy bunny (ugh, nor would I). I judge by how healthful a person looks AND takes care of themselves.

Yes, but I do judge people who judge others by their appearance as pretentious c...

I guess, for me, it all hinges on at least 2 things: (1) are we talking about their clothes or their bodies/faces, and (2) what we mean by judge. I definitely make assumptions (that may be wrong) about people based on their clothes. If they're wearing a sports-team jersey, I assume they're into that sport and team... if they're wearing a MAGA hat and an NRA T-Shirt, I probably won't try to make friends with them! If they're bodily handsome or ugly, there's little I can tell beyond that. Of course, if one's looking for a romantic partner, some level of base physical attraction has to be there... but there's someone for everyone in this big world!

I try not to, but it can be difficult some times. It also depends on what kind of relationship you have, or plan on having with that person. I usually don't judge random people that I pass by, but if I'm going to be friends, or if I'm interested in dating that person, then it matters more, whether it should or not.

Only if you don’t have eyes.