I do, and I will continue to do it.
It’s polite, and I was brought up to be polite, both to my elders and to my “youngers.”
No, you can’t mean that I wasn’t three feet from the bicyclist? He wasn’t in the bike lane. He was in my lane, and if I stayed three feet to his left, I’d have been riding on the median.”
The sales clerk took extra to time to wrap up my things so they wouldn’t wrinkle. I said, “Thank you, ma’am.”
A young person saw me coming from quite far away and stood there holding the door open for me. What do you think I said? “Thank you, sir. How very polite. Tell your mother she raised a very nice young man.”
Another time, at another movie, a young person walked right in ahead of me and let the door slam in my face. On this occasion, I said, after opening the door myself, and after I’d stopped rubbing my poor nose, “Thank you, sir. For nothing. That was rude.”