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Obviously it would be better if nobody Said racial slurs but this isn't a perfect world also I mean in the context of the ga word people say It cause according to then its not a slur
I reverse card UNO your argument: it's not uncommon that asians people are called by offensive slurs (and it's not rare that people don't even realise it) therefore if a black person use one then does it give the right for the asian people to use racial slurs again?  Or if you use a gay slur in front of LGBT people, can they use the N word?
Isn't it a very childish way to behave? like "but mum he started it!" 
Wouldn't it be better if actually nobody used racial slurs at all?