My parents are actual boomers by the definition. Though I think my dad was technically just before the actual Boomer generation. I lost him last December. I don’t really remember it but they raised me to be polite. So they must have been as well.
Interesting story, I used to go to a family owned Mexican restaurant that my parents were well known at. The owners daughter waitresses a lot. One day I had asked her for something adding please at the end. And she thought it was the oddest thing. She said I didn’t need to say please. As if because they was serving us my politeness wasn’t needed. That seemed odd to me. I’m guessing she was millennial just by the age she looked. Was younger than me but not a teen. It didn’t stop me from saying please and thank you, but for some reason that always sticks in my head.
My mom recently said she noticed I am like that with servers and other staff at places much more than my siblings are. I spent a lot of time with my grandparents and people in their circle growing up. Much more tha my siblings did so maybe I got it from them. The pre-boomers whatever they would be called.