Hmmm... perhaps what has happened is that we have gone "beyond" traditional "lady-like" and "gentlemanly" behavior, then, because I will hold open a door
for a man coming into a building behind me, and I will also help a man who is having trouble in a store with a heavy object. Wouldn't you?

Even women -- wouldn't you?
Furthermore, saying "please and thank you" are cultural norms unrelated to "lady-like" and "gentlemanly" behavior. That gets to the question as to whether we are simply a rude society or not. There is no question that rudeness is on the up-swing, and we can get into a big discussion about why things like road-rage, air-rage and all these other more extreme aspects of rudeness are on the up-swing, too...