Yeah, I *really* hate gun chewing, too. Never thought of it as linked to AS, though. Maybe it is? It's mainly the sound of the chewing, I really can't stand the sound of people who eat with their mouths open, either.
What has happened is that on occasion, I seem to have disturbed people by the emphasis I've put on how much I hate gum chewing. Attending meetings is painful enough for me, without sitting between 2 gum chompers for 3 hours! So I just had to say, in the meeting, that I found gum-chewing totally out of order in an alleged professional workplace. That I found it as offensive as smoking (which was also deemed OK not too long ago). And that if I was CEO I would ban it, along with alcohol, smoking and punching the boss. etc etc.
What gets me is the herd mentality thing. OK, I did go into a diatribe, but it would have been fine if directed against someone smoking in the office. I believe that most people find gum chewing offensive, you just can't step over that invisible line in your criticism.