Chinese tourists, I always describe to people as basically shit american tourists on steroids. Truly awful. Screaming, self absorbed, obsessed with selfies and completely unconcerned with who they bump into while taking them, littering everywhere.
It's a product of lesser educated people very quickly having advanced in wealth. Their middle class erupted relatively overnight, in the great scheme of things. So you now have these dumb fuck communist, butt picking yokels able to fly around and spend money, but literally no concept of class or decorum.
And as someone who loves traveling China and has met some beautiful, kind people throughout that country, I say this of course as a sad generalization. Obviously it reflects on them all but of course does not represent them all.