Having lived in St. Louis, Chicago, po-dunk Oklahoma, California, and now smalltown Texas - I can say that the levels of "manners" and/or tradition varies, depending on where you live.
There was ZERO courtesy, manners, and tradition in California (at least, where I lived.)
But here in smalltown Texas, it's as if there's this implied competition among the folks to see who can show an *exemplary* level of courtesy (holding doors, saying "please" and "thank you" and "ma'am," the hats off, etc.)
Here's another one that floored me when I first moved here. I moved to Texas straight from California. Naturally, I was a bit of a "California driver" just by habit. You know, ride the person's bumper in front of you, drive like a bat out of h***, etc. Well, I'm going down the county highway driving like that and the folks in front of me would pull over on the shoulder of the road, and keep driving at what was their current rate of speed, to let me by. Happened all the time. I was wondering, "What are they doing, are they having car trouble?" I was shocked, to say the least.