That's generally true. In high school my black friends said I could call them N.I.G.G.G.A but not a N.I.G.G.G.E.R. I never did because it sounds stupid.
Being honest where i grew up i never had much contact with Black people and never really thought about it. Later in the Army i met a few and i remember one was giving his .. black Jive

I said to him what the fuck are you on about? he said "you donīt know how to talk to a Black man"

I just told him to fuck off. I actually got on OK with the guy after this. One of the Best friends i had in the Army was a Black guy from Fiji. Top guy.