China is terrible at diversity. They don't look like it because they don't have a history of foreign colonialism or slavery like the West. It's not based on greed/hate. But look at how they treat indigenous minorities (Uyghurs, Tibetans, Mongols). Banning minority language instruction, banning religious texts, mass surveillance, etc. They have a very hard time even integrating their own rural Han population (hukou system)!

In the CCP's worldview, diversity is not a strength. Historically to them, diversity=fragmentation=weakness (Warlord Era, Century of Humiliation). In contrast, Unity+Homogeneity is real strength. They want everyone moving to the exact same beat.

In much of America and Europe especially the large cities you can become a citizen, because that's a legal construct. In China you'll never become Chinese. Look at how Africans were targeted in Guangzhou during the early stages of Covid, regardless of visa status. Evicted from apartments/hotels/restaurants, etc.

They have the hardest permanent residency system in the world. Between 2004 and 2013, they issued only ~7000 green cards total (the US issuing ~1M per year!)