I thought this was more common in neurotypical people. Like neurotypical people are a lot more likely to assign other people into categories than neurodivergent people. Maybe it's just the kind of people I surround myself with, or maybe I'm just projecting my own distaste for categorizing people's identities onto others, but I haven't seen my friends participating in any black-or-white thinking.
Sorry. I am sometimes bad at trying to communicate my thoughts. When I was talking about categorization, I meant trying to fully define a person based on minimal interaction. I have known my friends for several years, so I like to think I can understand them, and I even put in a disclaimer saying I might be projecting my own thoughts onto them. I'm sorry if I offended you, but I'm not sure how I did.
I have a similar experience to stingpie. When I meet someone new, they're a completely unique person to me. It just doesn't cross my mind to take experiences with other people and apply them to this new person. If you ask me to consciously think about it and put a hypothetical someone in a bucket, then I can tell you that given two people with traits x and y, which one is more likely to fall into a particular bucket. But if I meet this hypothetical person, I'm not going to act as if you belong in that bucket. That's not something that comes naturally. I'm guessing this is also what stingpie is trying to express.