I'm going to say the same thing here that I would say if somebody saw me stimming in public: it really helps me with anxiety, it's physically harmless to me, I will probably be a lot more anxious if you asked me to stop, and please don't stare :) You could also just ask! "Hey, are you okay? Can I do anything?" Asking why someone does something (without judgment!) will probably be super helpful. At least I would really appreciate it!
@english That is a great question. The hardest years for me just got over with, actually. I had to spend a very long time learning about the kinds of things that make "normal" people likeable, and create a public persona that I have come to realize will be accepted in most situations, or at least give off the impression of someone "normal." It was the realization that, "this is how my brain works and it's never going to change, so what can I do to blend in?" I don't think those on the spectrum realize how lucky they are that social skills come naturally :) Happy to talk specifics over messages too; just ask!
Doesn’t matter, people don’t care about savant, genius or all that crap. If someone is a bad person, can’t socialize, or understand emotion, they are dangerous and need to be re-educated, locked up or executed. Society doesn’t want or need them. Fine when they are a small child, but at as an adult dangerous. Usually highly abusive, sexually as well as physically and verbally.