Lol I see non black ppl drop n bombs(without the er) ALL the time when there are no black peeps around.
I grew up in the southwest side of Houston and had a bunch of black friends growing up. Around them, in my comfort zone, I'd say it without thinking twice. But its not something I really say anymore, even with my black.friends in dallas, and its njot something I'd ever say around black people I don't know. For the most part its never gonna slip.out of me unless I'm back home with childhood friends. I don't knw.how it is in other parts of.the country, but that's pretty normal in the south.
Also, while eminem doesn't say it publically, he probably drops n bombs all the time in his personal life.