My girlfriend called me a nigga and said it's funny, what should I do?

Rj5x4
My girlfriend called me a nigga and she's mexican, she thinks it's funny to and I tell her to stop without getting violent or doing anything of that nature and then one day she told me, are you not black? I said I am and she said then you're a nigga. Should I be offended or not?
My girlfriend called me a nigga and said it's funny, what should I do?
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