Drew DeVault (sway, sourcehut, hare... creator) wrote an article on this exact topic, asking autistic people on mastodon what they think of it. The tldr is that autistic people (those who answered) hate this excuse because they rather know when they make people uneasy to try to adjust, and also that if we need to tolerate this kind of discourse to make room for a minority of autistic people, then we are not doing a good job because it makes a lot of people really uneasy.