Explain how he's being racist, or are you just another moron who thinks that saying the word nigger automatically makes you a racist if you're white?
You might not think it's racists, even though you probably are racist and don't even know it. But you like a defiant little kid who wants to curse because his parents don't let him, are using a word that 100% of the hardcore racists use to put all black people down.
The more people object, the more you will want to use it, the more resentful you're going to get towards black people, because a lot of them don't like being called that.