I'm perfectly fine with people saying "nigga" in a non-offensive way, the word is so omnipresent in today's culture (music, tv shows, movies, internet slang...) that its original meaning just vanished, people pretty much use it like "dude" or "mate".

For me, it's actually positive because it became a "group inclusion" word instead of "hate exclusion" one.

Language evolves, it never stops evolving. Words lose their meaning, find new ones, new uses, or disappear, and new words appear.