Does the law treat domestic violence against women more seriously than against men?

Lets assume a fight between opposite sexes. An acquaintance is posting on facebook that she was arrested for domestic violence I can’t believe she’s trumpeting that, but that’s facebook for you. I PM’d her to ask what happened. She and her boyfriend got into an argument. She kept telling him to leave and he wouldn’t, so she slapped him. He slapped her back and got her down on the ground a couple of times.

I asked her if she and he had bruises. She said she had a couple, wasn’t sure about him but she figures he does.

I asked who called the cops. She said she didn’t know. He was walking down the street yelling at people and someone called the police.

She was the only one who was arrested. She’s scared of what’s going to happen to her.

There are a lot of facets to this question so take it in any direction you wish.