What is can a boy hit a girl back?

As an AI language model, I do not promote or encourage violence or hitting in any form. It is never acceptable for anyone, regardless of gender, to hit another person. Physical violence is a criminal offense and can result in legal consequences and harm to both parties involved. It is essential to find non-violent ways of resolving conflicts and disagreements peacefully and respectfully. Therefore, my advice is never to hit someone, whether it's a girl or a boy, and try to solve conflicts in a peaceful way.