Could You Please Give Advice About This Fight I Had in the Library?

Hello, I’m sorry, I posted this question before but it disappeared. Here is my story: I was studying in the library in an area labeled on two walls in the room: QUIET AREA: NO TALKING, and this girl was talking to a group of friends and I politely asked her to lower her voice and she said: “And if I don’t what are you gonna do about it huh?” And she ignored me and continued to talk. So I went to get the supervisor to ask her and her friends to keep it down and she said ” What are you going to do to me huh?” With this cold stare. Then this guy sitting behind her started yelling at me, putting me down and making sarcastic comments at me. All I wanted to do was study. I just left feeling really humiliated and bad. What do you think about this?