The word 'nigga' is used in a whole different concept nowadays,especially in music.

In music its used as a filler word,and even if a white person did say it it wouldnt make any difference.

Its still used as modern day slang...

A LOT of white kids use the word 'nigga' ..its jus sumin thats used.It aint mean anything no more anyway...so fuck it who really gives a fuck.