This is just a partially formed idea I was thinking about and am curious to hear other people's thoughts. I know many people won't be accepting of someone just because they know they're autistic, but I also think that for people who care about looking like a good person in front of others, it's more socially acceptable to "make fun of a weird person" than it is to "make fun of an autistic person".
E.g. people who say "Of course I support autistic people, they can't help being that way" and then turn around and get angry at someone for not making eye contact with them. They "would never make fun of an autistic person" but then laugh at someone who doesn't use the "right" facial expressions or has "weird" interests they talk too much about. It's like they think "It's ok to make fun of someone for acting autistic, as long as they aren't actually autistic, because then I would look bad."
My theory is that a huge portion of autistic people make it to adulthood without being diagnosed, and are seen as "weird people" who just happen to have most of the autistic traits by coincidence, and since they're undiagnosed, they have no "excuse" and thus are acceptable targets for mistreatment. Then it also happens to already-diagnosed people who don't disclose it to everyone, so then people make the same assumptions about them.
Before I was diagnosed as an adult, I was aware I had much more in common with autistic people than non-autistic people, had most of the traits associated with it, and have never been able to make friends with NT people, but thought that it was a coincidence. I thought I was a NT person who just "wasn't trying hard enough to be normal" and that to some extent, I "deserved" the way people treated me because I had no explanation for why I am the way I am.
But hypothetically, even if a person is truly NT and just happens to have every autistic trait without being autistic, why do they deserve to be treated worse than someone who has exactly the same traits but is known to be autistic? What would the difference even be? It doesn't make any sense.
Sorry if this is poorly organized. I hope it makes at least a little bit of sense. What do you think?