AITA for “embarrassing my gf” by getting a group of children kicked out of a theater?

Scream 6 just came out and i (21m) am a huge fan of the franchise. I went with my girlfriend (22f). We were the first in the theater and everything was awesome until a group of 25 middle schoolers came into the theater. They were sitting behind us, moaning, yelling, and throwing popcorn at us. Someone else must have complained because an usher came in and started yelling at them. When he asked who was throwing food I turned around and pointed to the group. At this point half of them got kicked out and the other half came and sat right next to us on purpose. Obviously I can’t fight children so I got up and got them kicked out after they were taking pictures of me and flipping me off. When a middle school girl asked me “are you mad bruh?” I told her to shut the fuck up. My gf said I was being a male Karen and they’re just kids being kids and that she was embarrassed. AITA? Her argument was that it was awkward because we’re only a few years older than them and I was acting like their dad. I’m not trying to be an old man but Jesus Christ shut the fuck up.