It's very easy. Just point out how all the explicitly anti-China countries are white, or military vassal states of white countries (Japan)
Then point out the military base situation in Africa--look at all that CHINESE colonialism:
https://issafrica.s3.amazonaws.com/site/images/2019-08-27-iss-today-foreign-military-map.png
Also point out how literally every Muslim country is okay with China with respect to the Uyghurs.
Then if you want you can talk about Lebron James and Terry Crews. There really shouldn't be a single Black person or POC who is anti-China to be completely frank.
That's just it though. Generally, a health amount of us support China in many cases compared to the West (including with the Belt and Road Initiative in Africa, as it actually benefits the people unlike colonial oppression). But the occasional racial issues in China are still a very real thing, and do properly need to be addressed.
It's kind of hard for a lot of people here because black people aren't especially common, and so there isn't enough active conversation about it. I really hope to see this improve as ties with African countries increase.