The prosecution suggested words for her to say. They said "In your culture it's not racist if you speak like that about whites, right?". Can you imagine if other whites would say "In black culture whites are called crackers.". They would say that's racist to accuse black culture of that.
Also, what if a lawyer asked someone if in white culture blacks are called the N word? They would say that witness is racist. Like Mark Furman.
We don't have to imagine. We just have to look at what Johnie Cockran, YM"S said. He accused Fuhrman of being like Hitler. "Who polices the police? You police the police." UMM HMM! And "if da glove don't quite, you must aquit. UMM HMM!".