I worked at two different elementary schools, teaching primarily 1st and 2nd grade. One being a rinky dink private school in Luoyang, the other being the more prestigious Hua Mei school in Hangzhou. The Hua Mei kids came from much more wealthy families, many from high rollers in Shanghai as well as a lot of kids of foreign dignitaries (who could speak neither Chinese nor English, they just sat there in class and did nothing). Many could speak Spanish, Italian, or English as fluently as Chinese. Anyway, the Hua Mei kids were HORRIBLY behaved. There were two classes in particular where it was constant screaming, fighting, running around, ripping up materials, etc. You'd have to see it to believe it. The Chinese teachers seemed as exasperated as I was, but nothing could be done about it. Or would be, I should say. My Luoyang kids were angels compared to the Hangzhou kids.
One thing that disturbed me most about my students at Hua Mei was that since they had little personal supervision at these boarding schools, and little to no discipline, they tended to be touchy-feely is very inappropriate ways. Not just the finger-up-the-teacher's-butt routine, but grabbing, pulling down their pants and showing each other their goods, grinding their crotches on you, etc. There was nobody around to tell them not to do these things, basically, so they saw nothing wrong with it. How this would affect them as adults is hard to say, but it seems pretty dysfuctional to me.