I'm not so certain what they're speaking of is racism as Americans know it. It may be a form of "culturism" (where a group believes "My culture is the best.")
I have a friend who was raised in Vietnam of pure mainland Chinese parents (from the diaspora). Educated in Chinese schools (there was a huge Chinese community in Saigon where the Chinese dominated business), he spoke primarily Chinese until the age of 14. In his 14th year, Chinese schools were forced by the Vietnamese government to use the Vietnamese language in all classes, so he had to learn formal Vietnamese, and to read, write and speak Vietnamese in, say, geography class.
In summary we have an individual who
- culturally is classical Chinese,
- was born in Vietnam,
- is a naturalized US citizen,
- whose Chinese cultural habits and language date from the time of his parents' migration (circa 1920's) and are classical (non-Mandarin) Chinese,
- whose Vietnamese language and cultural skills are weaker, dating from middle school on,
- who also took English as a foreign language beginning in middle school,
- who also learned Mandarin so he could speak to his brother's new wife, a mainland Chinese woman.
Anyway, he worked in an office in the USA with mainland Chinese, Hong Kong Chinese, Vietnamese, Taiwanese, and the usual mishmash of other Americans. Astonishingly, each of the Chinese groups, and the Vietnamese group, treated him as an outsider. With the exception of the Vietnamese, these groups tended to promote from within and to prefer their own group in inter-office politics. He went so far as, at one point, to specifically inquire into people's beliefs and was surprised to find that there was _no_ group that accepted him as a member, except the Americans! This despite the fact that everyone liked him.
Recently, for reasons unknown to me, he has become a flaming pro-mainland Chinese proponent vis-a-vis the USA, despite having no direct ties to the current Chinese culture or government. Many times I've had to point out to him that the only thing he truly is, and the only culture that truly accepts him, is "American".
I really got his goat by pointing out that he has little in common with mainland Chinese, certainly neither language nor culture, and that he is to them, culturally the equivalent of their grandfather or even great-grandfather.