It's usually pretty easy to tell if someone wants to / is willing to talk to you or not, and if you can't tell that should be answer enough.

so we're going on implicit nonverbal body language sorts of things? how does this account for diversity? people from different backgrounds, different socializations, etc give and receive signals differently.

this is like communications 101.

this legit seems kind of insensitive, ableist and elitist.

In other words, "if you're autistic and can't read body language, assume that nobody wants to talk to you."

Real inclusive there, pal.

> if you're autistic and can't read body language, assume that nobody wants to talk to you

This is a good point, which is why we exercise judgment. Pretty much all laws are written for an imaginary "average individual" because they cannot possibly account for all the wide diversity of people's mental and physical abilities, but that's why determining whether there's been a violation of the law is entrusted with a person, not an algorithm, who can consider whether there have been extenuating circumstances, and being autistic qualifies. Obviously, many laws aren't meant for people who are unable to comply with them, and every law recognizes that there may be valid reasons for breaking it.