The worst thing about children misbehaving, are misbehaving parents acting like kids.
Just because they’re permitted to be belligerent little ignoramuses at home doesn’t entitle them to do so in public:ie the bus.
I enjoy reminding other people’s kids to have some respect, or not to piss on the bench, particularly when the parents sanction such shitty behavior.
Kids can learn but the grown ups should already know!