Well I'm not going to police anyone's words or anything unless I'm personally offended or I feel folks are getting disturbed. You do you man. I personally wouldn't drop nigga amongst a community of people I've assumed (perhaps incorrectly I'm willing to admit) to be mostly non-PoC (DGAF), but not everyone is me.
My black friends? I use the word if they're cool with it and always have though I'm using it less and less nowadays out of personal choice. But I've always used it out of endearment.
So yeah, feel free to ignore this post but that's where I stand.
S/N: Not that you asked but I dunno if we're close to being the same age or if you're younger than me, but I will say that if you don't look white at all - you may not think of yourself as a 'black american' but, for all intents and purposes, you are not white and the luxury of being able to live 'race-less' is out of the hands either of us were dealt in life.