...And here I am questioning why either of these things are a thing. Like how can you even use Autistic as in anything other than labling and actual one. There's already retard, dumb, and stupid so I guess I just don't understand.
The overuse of insults leaves the word meaningless, so that when now you call someone retard they just ignore it. That's why people look for new ways to insult. It will eventually happen the same to "autistic" and it will end up becoming another generic word for insulting.