I'd just like to point out that slavery was never exclusive to a single race. The Chinese were slaved, even white people were slaved, but do they remind the whole world of it years after it happened? I feel that using slavery as justification for not using the word "nigga" is rather silly. The word is derogatory, yes, but "oh you owned my ancestors" is not a reason to be offended.

Nigga is a word I use hardly ever, and it's only when I was addressed as nigga first. I mostly frown upon its usage because it's literal meaning, even without derogatory notions, is "an undesirable person".

As for black privilege, I'll just point to my first paragraph. Everyone is entitled to being offended, but I think it's silly to be offended by something that doesn't affect you. The sentence "Black people used to be slaves." is not racist, but interpreting that as "You think I'm a slave." is definitely racist. It definitely isn't my fault you thought that, but now I'm racist because you decided on your own behalf that I must be.

(I understand my words may appear hostile, but they are not meant to be. This was based on personal experience, any members of the black community that may read this are not having shots fired at them.)