The basic assumption here seems to be that it must be racism because white people are involved. Unfortunately racism is fairly common amongst all people regardless of their physical characteristics.
There is no such thing as the black "race" or the white "race" or the whatever superficial distinguishing features you want to choose "race".
To illustrate the point, all the native people of sub-Saharan Africa have the black skin adaptation, yet there is more genetic diversity in these people than the rest of humanity put together. Nothing surprising here there have been modern people in Africa longer than anywhere else.

PP