If he racially abused her, that's not OK. But we don't know that he did. I've never heard that claim before and, given that they've been embroiled in a bitter divorce/custody battle, I wouldn't trust any unsubstantiated allegations made by either party.
Why would he racially abuse her? He married her and had a child with her. The same child he is fighting to keep. I highly doubt he is a racist.
I think what she is doing is unfair.