The article never states that common courtesy is unfeminist. And you'll find that your conservative friends are just as likely to be boorish as your hated liberals.

What she's saying is that Emily Post's rules weren't all an unalloyed good. Mixed in with her admirable entreaties to make life easy for other people was the unblinkered faithfulness to heirarchy. That was the unfeminist part - the absolute separation of servant and served, the absolute subjugation of wife to husband - not the bathing before flight or keeping private conversations private.

There's a lot about American society today that could be better, but you're kidding yourself if you think the 20's or the 50's were a better time for women.