Pete Rose had 4,256 career hits.
Under the law gender does not matter. You might be able to claim self defense. Socially no, you can't hit girls as it is against social norms.
yes punch his lights out
I would counsel you to contact the state family services department in whatever state you live in. As far as I know it is illegal to hit a minor in most states. Just by you asking the question, can...
No. Guys hitting girls is a pathetic thing to do, and you can get him in trouble if he 'hits' you.