You are not alone. I was in Thailand and Vietnam this spring and was really taken aback by some of the behaviors. Turns out it was Chinese tourists. All the locals were annoyed with them. Google it. Even the Chinese government is trying to educate it's people on how to behave when traveling. There are lots of reasons for it.
http://www.jeraldinephneah.com/5-rea...s-are-so-rude/
I was in the men's room at the Da Nang airport. About five guys waiting for a pisser. Chinese guy comes in and just walks right past. Couple of us pointed to the back of the line and he acted like he didn't understand. Only when he saw we weren't going let up, did he go to the back of the line. This was one of a dozen similar instances I witnessed.