So a woman beats a man and she "beat that ass"? But if it was the other way around would you still word it like that?
Domestic abuse is never OK. If she's a serial abuser she shouldn't be raising that child either.
Everyone has a right to defend themselves. Most men don't because it's drilled into their head since they are little that they must never hit a girl even in self-defense (which is a sick and twisted logic), or if they do they
will still be arrested. It's truly a tragic state of affairs and a breach of basic human rights.