Why do guys think the can push girls around? Especially my little sister. I just found out some guy (who may I add is significantly taller and older than her) slapped her across the face and called some profanity words at her. Now what do you guys think I should do, let this bastard know what's on my mind? Or let the adults take care it.

Oh, this guy is a sophomore (my age) and my sister is a freshman. Please comment, I really don't know what to do.