Right, you haven’t. That’s my point.

You’re reacting to the worst parenting you’ve seen in public, but they’re thinking of the worst experiences they’ve had, too – which was people overreacting to relatively small transgressions.

Everyone is talking about a completely different set of people than who they’re talking to. Both of those different sets of people are terrible: the parents who haven’t even tried to teach their children, and also the people who overreact when a child steps out of bounds. You are neither of these, and it looks like neither is your interlocutor.