There are some things that make me not want to eat in places. Nose picking is one of them. While in Thailand a few years back, my waiter while waiting for new customers was going for the gold medal in snot mining. I complained to the manager, and he shrugged, like it was no big deal. Maybe Thai's don't care, but when you're serving foreigners, you should be aware what they find offensive. I didn't go back, of course.