Actually I'm fairly popular, but that just leads to me catching a lot of attention from strangers who's first interaction with me, not knowing I'm autistic, is seeing somebody rude and dismissive.
If I could just explain to everybody immediately "hey, I'm autistic, I'm not being rude on purpose," that'd be great. But most of my interactions with people are short messages like "What outfit are you wearing on your character" or a quick invitation to join them for something. Not a lot of opportunities to explain to them why I act the way I do.
When I do get the opportunity is usually when I end up making real friends, because they don't see me as the dismissive girl who doesn't want to talk to them anymore, but instead the autistic girl who just interacts a little differently.
Hell, some people keep trying over and over again to be my friend even when they think I am being rude and dismissive, they just don't make any progress because they've misread my mood and assume I want them to go away.