I often criticize the U.S. I can see problems in the States and especially from my vantage in China. However, I find that I hate it when my Chinese friends criticize the U.S. I am not fully sure why, but I dislike it.
I also notice that my Chinese friends criticise China just like I might criticize the U.S. I learned by their reactions that I should not jump in with them and dump on China.
It is not that China has no problems. Certainly China has problems as do all countries, and being a big country, its problems get a lot of attention.
So, I find it a point of wisdom to let Chinese people dump on China without my help. I think you might also find it best as much as it feels so good to dump on someone else’s country.