Hold on Iun, you've quoted Animal there and yet you've been rude yourself. "Shushing" somebody is not polite, asking them if they would please stop the crackling would have been polite. A teacher shushes their pupils, not out of politeness, it's an order to them.
If I was that guy I'd have smiled and asked to see how hard you bite, then I'd have slapped you about.
As for the kids, you could've just politely asked the parents to ask their children to calm down. Seriously, if someone had said what you had said (hitting them) about my children (albeit I don't have any), I'd have laid you out flat! Goodnight to you there and then on the spot!
If you'd gone about it politely I'd have done as you'd asked.