Until I came on message boards, I'd never heard of tipping the mail carrier or garbage man in my entire life, in which I've lived all over the country.
Growing up, we did tip the paper boy at Christmas and my mother gave her hair stylist an extra tip in December. Then again, my parents also got BIG Xmas bonuses from their employers (I remember in 1974, my father got a $500 Christmas bonus in cash. That was a LOT Of money). In our entire working lives, my dh has never gotten an Xmas bonus and the very few I've gotten have been so inconsequential and had taxes taken out of them, making them almost nothing.