"Sociologists use the term “androcentrism” to refer to a new kind of sexism, one that replaces the favoring of men over women with the favoring of masculinity over femininity. According to the rules of androcentrism, men and women alike are rewarded, but only insofar as they are masculine (e.g., they play sports, drink whiskey, and are lawyers or surgeons w00t!). Meanwhile, men are punished for doing femininity and women… well, women are required to do femininity and simultaneously punished for it."
Androcentrism: It’s Okay to Be a Boy, but Being a Girl… » Sociological Images
I think the ‘women are required to do femininity and simultaneously punished for it’ bit sums up 90% of sexism in one sentence.