Thats very odd, From my high school, through colleges and beyond, I never really encountered any africans, with very very few exceptions, who would be racists. They were generally hardworking and good students. Granted, they did seem angry at the african americans, but it was moslty because they felt that the african americans, in there eyes were lazy and whiney.
I felt bad watching some of them change, I knew one guy who felt that the whole "racism" was the equal of crying wolf, by the time he graduated, he had started to become more paranoid since he was always being told there was racism and he just didn't see it. Believe it or not, the test scores of blacks, actually drops down more if you take africans and carribeans, and 1st generation people out.
I never remember one of them condoning genocide, I saw the opposite, with the almost expectation, that America should go to the homeland, invade and install a democracy there, these people wanted interventionalsim and not a one ever complained about americans having to much freedom.