I think maybe the fact that blacks find it acceptable to call each other nigger, but racist blacks in particular, find it offensive when used by others that are not black, shows the depths of black on black oppression. I see it as a modern version of the same hierarchy set up during slavery. The "slave mentality". When blacks were slaves you had house slaves and field slaves. House slaves naturally were more exposed to the white community than blacks. They were the ones that directly received the hand me downs, the left overs and so forth from the property owners. They were in charge of any unpleasant task in the household, including dispensing and dividing what was given to all of the slaves on the plantation, them by their owners. The black racist has become the new slave owner. S/he decides what is objectionable to the black community. It's okay for the black racist to dictate what to protest and what to condone, within the black community. They profit from it. As long as there is inequality, they are determined to exploit it. This is why it's okay for the black community to call their own niggahs, but not okay for anybody that don't own them, as now black racist own the community. Grrrrr Back off! Grrrrr My Niggahs! Grrrrr.
Time & Tide Changes Everything