What Do You Think About This Fight in the Library?

I was studying today in an area labelled QUIET ZONE: NO TALKING ALLOWED posted on two walls in the area. A girl kept talking to her group of friends and I asked her politely to keep her voice down. She just said to me, “well, what are you gonna do about it if I don’t huh?” And went on talking. So I asked a supervisor to ask her to stop and she wouldn’t do anything. The girl started saying “What are you going to do to me huh?” Then this guy starting yelling at me and putting me down and I left. The whole thing feels awful and I felt humiliated. I was just trying to study. What do you think about this?