Who said anything about flipping out on the teenage girl making minimum wage being the right thing to do? Is that how you interpreted my comment even though I very explicitly denounced what happened?

I think actions such as politely voicing displeasure at the policy to the worker so they understand that many people think the policy is dumb, asking to speak to the manager or owner, and leaving so the restaurant doesn't get your business are the right thing to do in this case.