My suspicion is that neurodiverse people are already used to feeling marginalized and unacceptable for invisible reasons, so there’s less of a social barrier-to-entry in coming out. Like, “Everybody already thinks I’m weird and doesn’t want to hang out; might as well tell 'em I’m queer.”

I think there are probably a lot of neurotypical people that have non-heteronormative impulses and try to quash them for the sake of social status.