Why can girls hit boys but boys cant hit girls back?

It is due to outdated views on what is proper. In all reality, some females can be as abusive as some men. In ways it is worse because of societies views. If the guy shows that he is hurt, he is looked at as a wimp for getting "beat up" by a girl. If he defends himself, he is the guy that hits a girl. His alternative it just to be quiet and take it. It can be a no win situation. In more recent times, the problem is starting to be recognized, and better education is starting to come about. It is not right for a guy to hit a girl.