A few times ago, I was drinking beer in the street in front of an American coworker. He was a bit shocked and I said “of course you can drink wherever you want, it’s the land of the free!” and I loled. I thank the internet for teaching me about weird customs all around the world. The end.
Chances are he’s old enough to have been young and knows all about this. At least I do and I was not that dumb. And if you reply that it’s worse nowadays, let me teach you about what happened since the 60s…