Some Black people deny that Black racism exists at all. Which is, of course, absurd. Just look Holder and Obama.
But, other Black people admit to Black racism, but say that their racism is 'justified'. In different words, they are claiming a 'right' to be racist. Which is equally absurd.
BTW, Black racism is not confined to just White people. There have been countless 'hate crimes', done by Black people against gays, Asians, Latinos, etc., basically anyone. If a person who is not Black moves into a Black neighborhood, they will be physically assaulted within days. It does not matter who or what they are. If they are not Black, they will become an open target for assault.