"Nigga", period, is so fucking stupid and I am clueless to why so many people use it.
I'm black, and I was raised that calling some one that meant "ignorant black person". It's so ignorant of black people to think "nigga" is a form of greeting. I was taught "nigga" derives from "******", whuch we all know is a very low racial slur more commonly used during the slave days & now we are using a slang form of it as a greeting and name to call each other and that is beyond fucking stupid and people should wake up.
Personally, I don't care what race you are. You can say whatever you want and the word is only bad if you give power to it, even thiugh I still think "nigga" is stupid. I don't mind if a white person calls me "nigga", most of my friends are actually white & say it more than me.