Dr. Laura says sorry for using N word on air

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Xbbjf9s said:

 When the word is used between blacks, it's equal to the word "dude" not  meant to insult and it's said nigga not nigger..Dr. Laura needs to watch the Boondocks to know thw difference lol.

isn't that itself is being racist ? i mean you are differenciating who says it (black people) and who shouldn't say it (White people)

i mean i say Nintendo all time , no one find it offensive..