Indeed two wrongs don't make a right, and saying "you can't just physically and mentally abuse a woman and then came back like nothing happen" is a bullshit sexists argument, because it implies if the target is not a woman then it's okay.
Is it because it's a physical and mental abuse or just because the target is a woman?
She did it to him first, is it okay if the target is a human with a dick and classified as male?