What I hate is the expectation of a tip in a country with little/no tipping just because I am an American. Had someone at the desk of the Hilton Wangfujing call me in my room after arrival and ask if I tipped the bellman (I did not... no small bills). If I had been a Chinese businessman, no way they would have called my room.

Happens in Europe as well. Speak English with a US accent, you clearly have lots of money and are required to pass it out..