> I work with a lot of people from mainland China and I have not once gotten the impression of any generic sensitivity to criticism of China.
Those kind of reactions often, but not always, get muted the longer the person is exposed to more diverse perspectives outside of the mainland.
There's also a cultural trait in China where you strongly defend your in-group against criticisms from an out-group, even if those criticisms are valid. I have a Chinese friend who considers his mom to be kind of lazy (and tells her so), but if someone from outside the family made the same criticism, he'd strongly defend her as a hard worker. The same thing is true of criticisms made by non-Chinese of China.