Do Ты believe that it is rude to tell a room full of obnoxiously loud people to shut up?

I just wanted to get peoples opinion's on this so that I could decide for myself if shouting "Shut up!" at the вверх of my lungs to my homeroom was considered rude by them или not.

I was trying to listen to the announcements(specifically for Prom Court, because I wanted to know), and our teacher was trying to get everyone's attention. He kept saying, "Are Ты guys listening? They're announcing the Prom Court! Hey, are Ты guys hearing this?" and they repeatedly ignored him. They were practically screaming at the вверх of their lungs, and I was so irritated at that point that I turned my head to that specific side of the room and told them(very loudly), to shut up. I've gotten some nasty looks from some of them since that transpired, and I feel like they think I was the one being rude.