It's not about ethnicity, it's about culture.
People who have grown up in China (in my experience) have a completely different mindset. Speaking about something as simple as freedom of speech, or the concept of citizenship through naturalization, or the idea that a poor nation (America) prospers with liberty rather than having to grow before they can have it (the actual excuse the party gives for what we consider tyranny), could be difficult with some people fresh out of China.
I have had long conversations with people who have grown up in China about things like The Party silencing (often imprisoning) dissenters, and controlling Chinese nationals even when they are abroad; typically they will justify the actions of The Party by saying that the Chinese people need to be controlled right now because they're not rich/developed enough yet, and that liberty will come later. When I say that the United States started with squalor and deliberate liberty, then developed into a nation which is stronger than China with a fraction of the population, it falls on deaf ears.
Ethnicity is culture. (That is, ethnicity is the state of belonging to a group with a shared cultural identity.)
Those rich kids driving luxury cars in the US would be driving the same brands in China; the ruling class doesn't have much of a sense of modesty that would speak against flaunting their wealth in this way.