Haven't met any Tibetans, but I talk politics with Hong Kongers somewhat regularly, both in and outside China, and Uhigurs both in Xinjiang and Kazakhstan, last time I was there and the time before that. Of course if you think the Chinese government controls Kazakhstan, Vietnam, Cambodia, and Japan, IDK what to tell you.

Last Taiwanese person I met we only talked about green tea, and they seemed really defensive about it so it didn't seem like talking about politics was a good idea.