I was talking to ds3 (aged 14) about a boy in his year who has been bullying ds4 (aged 11) and ds3 described him as "a bit acoustic". I asked him what that meant and he said that's what they call people who have autism as it sounds a bit like autistic.
Is this a thing? Is it an insult? Ds3 has autism himself and one thing he struggles with is he doesn't understand whether things like that are rude or not.