A post on the importance of courtesy from a New Yorker - I'm impressed. Mark you, that is one place where public manners have improved. from a very low base. I remember asking a policeman for directions on a recent visit, and got a civil and helpful answer, a decade before it would have been "Buy a map, dad". Generally though, Americans are very polite, if in a rather folksy way.
yeah, manners are nice, but can be used to keep people at a distance - and icy politeness can be much more effective if you are angry than shouting at people. In those circumstances give me friendly tactless blunt any time.
Giving up seats on trains and buses used to be easy, one did it for "ladies". Now it's for old people and the infirm of either sex, and pregnant women, which is fine except that the older men are too proud to accept - and the women you thought were pregnant are often just obese, and thus offended by the gesture. Heigh ho.