how strange how we all see things so differently, we have recently returned from living in France for 20 years, and are highly impressed by the 'politess' of car drivers around the marina area where we live, the vast majority are really polite, wave when you let them pass, and stop to let you pass also - motorists here even stop at zebra crossings, a rare event in France, as is waving or smiling at other motorists.
I'm inclined to agree with both of the above comments, namely people here in the UK getting ruder (door opening reference) and overseas car drivers being worse than here (France as example cited).
However, forget overseas and concentrate on the country you live in now. People do appear to be getting more ignorant and ruder, and not just the younger folk either ! Basic manners and social etiquette have deteriorated noticeably over recent years, as the selfish me, me, me attitude prevails in society.