I had a colleague over from India - being within hearing distance of him eating was Guantanamo level torture. Apples were the fucking worse. You could have overdubbed them noises on top of horse porn. And snickers. I mean who the hell 'clacks' on a snickers bar.
Reminds me of a couple of American lads I met, out in Silicon Valley, telling me a story of a visitor from their Chinese subsidiary, who would go out for lunch, and then come back and spend the afternoon burping and farting really loudly in the office. They said he would do all the "lifting one leg up" tricks, to really force out a fart with maximum noise. Apparently it was not considered bad manners in the part of China he was from, a bit like Barnsley.