Why is it ok for a woman to physically assault a man but if he tries to defend himself the police always see him as the aggressor?

I met a guy once in this situation. He did nothing wrong. She attacked him because he wanted to lay down and take a nap after work. She wanted him to go out to dinner because she'd didn't want to cook and he didn't either. So she picked up a lamp and broke it on his head. So she calls the police and told them he beat her. So why should he get in trouble when he tried to defend himself.

Why is it ok for a woman to physically assault a man but if he tries to defend himself the police always see him as the aggressor?
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