There are at least three different ways that I think you are wrong. I don't know where to start.
1) First of all, China is very diverse place. Just from Wikipedia there are Zhuang (16.9 million), Uyghur (11.5 million), Hui (10.5 million), Manchu (10.3 million), Miao (9.4 million), Yi (8.7 million), Tujia (8.3 million), Tibetan (6.2 million), Mongol (5.9 million), Dong (2.8 million), Buyei (2.8 million), Yao (2.7 million), Bai (1.9 million)...
Several of these ethnicities, notably the Uyghurs, face considerable persecution.
2) There is no Universal truth. And if there were, the belief that you (as an modern day Westerner) have the Truth and every other culture is wrong is a little problematic (and cliche). If you believe that you have the Universal Truth... then you have to explain why you think that your culture is correct and all other cultures are wrong.
3) There is a discussion about racism in homogeneous societies (for example Japan). These countries tend to have right wing groups, policies and business practices that exclude minority groups. Again... whether you count this as racism depends on how you define the word.
Which of these should we discuss first?