I would agree with you except that I've seen people try to clarify that they're autistic, or ADHD, or bipolar, etc, and explain that it causes them to act in that manner and sometimes, no matter how hard they try, they can't surpress it or "act normal"; only to be told overwhelmingly by the people in the room/thread that they're an asshole and selfish for not trying hard enough.

I do understand that some of those things are used as visual indicators for people to determine how the other is feeling about the current conversation, and maybe it's way more important to people than I realize; but there are way too many people who will tell you that if you can't alter your behavior to be normal, then you're an asshole.