I was sat us a nice country put earlier (i.e. small and cosy) and the man on the next table crunched his way through a packet of Tyrrell's very crunchy crisps. Bad enough but then picked at his teeth and generally slapped his mouth about for a good 10 minutes after. I had to leave.
This isn't the first time. I've been subjected to loud chewers in restaurants before now as well. Aibu to think that if you can't eat quietly and not also your mouth about then you shouldn't eat unless you are in a sealed room. Or box in your garden.