When I was a graduate student, my class travelled to Shanghai to participate in an academic program. Before we arrived in China, we were briefed about the different norms and rules to follow while studying at a Chinese university.
The first rule was not to ask questions about controversial topics, topics that would make our hosts feel uncomfortable or embarrassed. We were specifically told to avoid the “three T’s”: Taiwan, Tibet and Tiananmen Square.
When we arrived, we learned that real list of taboo topics was even longer.