I’m not. Maybe I just go to better restaurants than you. It’s very common for the waiter to come by and ask if you want to order anything else before the kitchen closes. If you’re not doing that at your restaurant, that’s your fault. If a restaurant is starting to clear out, and it’s past the poster hours, I’ll ask when they’re looking to close up to avoid overstaying. But that’s as much courtesy as a customer needs to offer.