China has a huge population, even 80% of them behave nicely, there are still quite a giant group of people who are not that behaving well. And as the rapid economic development in last decades, some of those who are ignorant got the money to travel abroad. Chinese Tourists also dislike them a lot, Gov has been taking measures to blacklist them if they did anything violates the rules in sightseeings .Sorry for your unpleasant time you've had with some Chinese tourists. Be sure to visit China, there are something unique there, especially some ancient relics : )