
Sorry to laugh, but this sounds SO much like something I would have posted before I was a parent. Seriously, I never got what was wrong with parents of teens that they would "let" them act so rudely.
By most standards, my kids are good, they know how to act in public. They just have "attitude" and frankly, there is no 'rules' that can fix that. They will sit quetly with an annoying look on their face, or just go off by themselves, or something like that. It just isn't FUN. And you can't make someone fun. And you can't make two kids like being together if they don't (my twins don't enjoy each other's company anymore).
But thanks for the suggestion. Really, I just had the best laugh of the day because DH and I were married 11 years before having kids and I can just imagine me back then saying this to someone who was complaining about their teens. I even remember (before I had kids) someone at my work who stopped taking vacations because of his annoying teenagers and I remember telling DH I can't understand why he would "let" his kids ruin his vacations.

I was just so sure "my" little darlings would be different

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DJ