I think the point that @Judge
made, that 'the reality is that the vast majority of neurotypicals are either indifferent or ignorant of autism altogether' is exactly right, so I don't think there are autistic
behaviors that NTs don't tolerate. To me it's rather more simple; that every behavior in others that doesn't mimic their own is apt to be not tolerated.
If they know autism at all, it is most likely to be in the narrow framework of rocking back and forth or lack of responsiveness. They don't have a clue that someone who walks and talks like they do might be on the spectrum, and the only way to tell is if they don't make eye contact or prefer a dark room.
They are generally not tolerant of what they don't understand. Much, in fact, as might tend to be ourselves.