On the way home from work, there's a very narrow stretch of pavement outside a shop. Tonight I saw a bloke pushing a pram, with two more kids in tow, coming in the opposite direction. Instead of trying to squeeze past him, I stood and waited for him to get through the narrow bit. Which he did as slowly as possible, and instead of thanks for letting him go past I just got a furious glare in return. Rude fucker.
As I was about to start making vague grumbling noises under my breath however, the two little boys trailing behind him came past, and the second one said "thank you!"
So there you go. The last few generations are generally regarded to have lost their manners, but maybe there's hope for the next one.