Years ago, I visited the home of a fellow black friend. He talked about the "white people" on his job. It struck me that despite years of working with these people, company picnics and sharing birthday cakes in the office, my friend did not relate to his co-workers as Bob, Joe or Jane. They were monolithically "white people."
I'm sure some whites relate to blacks the same way, as a monolithic group rather than individual fellow human beings. Without question, America has zero tolerance for "white racism" while "black racism" is given a pass.