Years later my wife and I took our two grandsons, about ages 4 and 6, to a local restaurant. We were seated near an older couple, each of whom gave us looks as if to say "Oh great, there goes our quiet evening". The boys were well-behaved, and when we left the man thanked us for teaching them such good manners.
We had a similar event happen at a local pizza place that he eat in dining.
I could see out of the corner of my eye, the older couple look at the kids (2,4,and 6) and each other and kind of look defeated, like they knew their meal was ruined.
When they left, they complimented us on the kid’s behavior. I also made sure the kids knew it as well.