Were they always like that or is it a post Nazi Germany thing?
It's a generation 68 thing.
Women in germany are brought up by feminist bitches that had to fight for everything. They are brought up in the believe that men are shit and that you have to use them to reach your goals. Trust me, i have met a lot of german girls.
The typical attitude is: If you hold the door open for them, you get hissed at because "i can do that myself, i'm not a weak woman" but if you tell them to change the flat tire themselves because "she is not a weak woman", you get the above mentioned.
German women are feminist bitches.
I think we can trust James Bond on this one as well. In the short Story "Quantum of Solace" (not in the movie) he states (in a conversation about flying from England to Jamaica:
"Oh I don't know. It would be fine to have a pretty girl always tucking you up and bringing you drinks and hot meals ans asking you if you had everything you wanted. And they're always smiling and wanting to please. If i don't marry an air hostess, there'll be nothing for it but marry a Japanese. They seem to have the right ideas too.