Um, in my experiences working as a marine biology guide and running the introduction desk at a oceanside ecology center, Asian tourists (I think they might have mostly been Japanese,) arealways extremely polite and deferent and nervous seeming. Not at all rude. Probably because they don't know the language...very sweet and cute, like them a lot better than American tourists; they're in their own country, they're cocky, they speak English, they're cocky, errythang makes them the rudest by far...

And Chink students obv have a reputation as all being geniuses in math/physics.

anushka, Japanese and Chinese look alike but totally act differently. so it could not be the answer.
and Frank, why only Western? Chinese people are all around the world.