Every once in a while, certain people from the dominant society will act as whistleblowers on white supremacy. Especially certain white people who themselves are marginalized within white society.
Recently a gay/trans white man who goes by the name of Dakota Bracciale made a bold posting on his Facebook page regarding race. He warned Melanoid people that systematic white supremacy is so deep in this society, that no white people should be trusted.
http://melanoidnation.org/white-man-warns-all-black-people-dont-trust-white-people/