When I take Ethan along to Charles' Boy Scout troop meetings, I can always tell who knows about Ethan's autism and who doesn't. Ethan spends most of his time jump or spinning. The people who know that he has autism always give us very warm, affectionate looks.
The people who don't scowl at him (and at me).
Via liberal japonicus I saw a story in the The Guardian about Glenn Campbell, who now has Alzheimer's. There was a quote from his daughter:
"When he messed up, people were coming up to me after shows and saying 'Is your dad drunk or is he using again?' It upset me. Now this is out they're just going to be supporting and loving him rather than angry that they paid to see him."
Different condition, but the same result.