I’ve seen a fair amount of Chinese tourists and I don’t recall seeing them act in a way that struck me as particularly proper or improper. They’re mostly just walking around and looking at stuff. I also haven’t heard of specific complaints about their behavior. Some people complain about tourism in general, how some places get too crowded and prices increase, but it’s less about the behavior of tourists. Or when it is, it’s not the Chinese who are singled out for it.