I'm not excusing shit. It's annoying. People seem disconnected from reality of how annoying teenagers act in public, and this time that annoyance showed up at Minions: The Rise of Gru. Fist shaking at the youths is just old ass energy.
My teenage years weren't exactly a lifetime ago and nobody I knew acted like this. It's one thing to be an annoying teenager and something else entirely to show up to a cinema in droves and ruin the experience for everyone else to the point where refunds had to be issued, or cops had to be called to clear out rowdy cinema-goers.
It's disconnected from reality if you think that kind of thing is normal teenage behavior.