Is it classist of me to think this

I was on the Yellow Line metro, traveling from Borivali West to Oshiwara station. There was a group of kids in the coach, and from their uniforms, I figured they were probably from a government school. They were being really loud and obnoxious, making a lot of noise. They got off just two stops after I boarded, but while they were on, they were pretty disruptive. I know I sound like a boomer when I say this, but they seemed to lack any manners. Even if I’m right in assuming they weren’t from well-off backgrounds, that doesn’t mean they shouldn’t know how to behave properly. Is it classify of me to want these kids to follow basix etiquette?