Black people and White people alike have used the "n word" since the times the first slaves arrived.
It has become a taboo word. Blacks allow other Blacks to use it and use it themselves, but they do not want Whites to use it.
Once, I was fiddling around at my college after registration, getting all the stuff together foer the next day, since I was in charge of Humanities Registration that day.
Coach Parker the basketball coach and Coach Smith were talking about the team for the coming year. And Coach Parker said "We'd have a great team if we could get them n****rs to practice as much as they should. They always missing practice or cutting off before we're through. But you know, them n****rs LAZY! Then Coach Parker said, "Sorry Dr (Onassis) we didn't mean for you to hear that."
I think I said "that's okay".
Such is the nature of verbal taboos.