For Christ's sake!!!!
Short story...A customer of mine (whilst I had a pub) went to South Africa, married a Lady, and brought her back to the UK
She was highly amused that we couldn't use that word, yet she, and her friends used it freely, in two contexts:
a) someone that was idle or lazy
b) a dear friend..
So she freely admitted that, if she came up to my bar, and I greeted her with "Hey, Nigger, how are you tonight, what can I get for you?" She would be highly pleased......
Go figure....