There was a lot of stupidity involved on the part of the young guys and the old men both.
It was a dumb (and rude) prank to pull in the first place.
The old guys escalated things buy smashing the car (though I see it as justified).
The young guys were stupid to get all pissy about their toy getting broken.
The one old guy definitely crossed a line when he took a swing at them with the golf club.
All in all, there wasn't a lot of intelligence displayed by either group in that video. It was a group of young guys being assholes, and a group of old guys responding by being assholes too.