They're still shit. I bring my young kids to the park and around 430 the 12-15 year old kids roll in and are an absolute menace, like clockwork. Littering, cursing loudly, riding their bikes in between the play equipment.
I think there's a certain age where shitheads will always be shitheads. They get this little taste of freedom that comes with adolescence and they go overboard. I think it is just a part of life.
I try to say to my kids, hey, you don't like how they're acting now right? Then don't do it when you're their age. We will see if that works.
I played lacrosse in middle school, and when we'd stop we'd try taking the caps from our Gatorades and rolling them on the windshield of cars next to us.
I can't stand littering now, I do town cleanups, and maybe it's my way of trying to undo my stupidity.