I'm a male and I'm tired of hearing "there is absolutely no denying that sexism exists" because it's not "sexism", it's normalization of gendered oppression on a cultural level. Girls and young women are taught to be domestic, to not aspire to men's work, and they are taught half-consciously, culturally, through the media and activities they are made to take part in. Boys are taught that their competence is natural and are segregated socially and often physically from living, playing, and interacting with girls, and the culture of "girl-things"[1]. "The Gender Trap" by NYU sociologist Emily Kane documents this, and contains an excellent bibilography for more research on this. It is established academically, but people don't want to hear it -- it's radical feminist nonsense, man-hating (or "self-hating" if you're a male), so we don't have to look at the research.
But men are affected as well. Older men take longer to report symptoms of serious disease to doctors because they are taught that they should be able to handle it. Men are deprived of emotional outlet and expected to live up to impossible standards, foregoing friendships with women in the process. You see all these young men with unrequited love ("friend-zoned") who can't accept friendship with female people and thus must invent strategy to solve the woman-puzzle-box or justification for harassment.
Questioning gender itself is the best solution, logically.
[1] Rough examples for "girl-things" as a phenomenon: A girl can wear blue or pink, but a boy wearing pink is doing a "girl-thing" (I've read that the color scheme was reversed a under a century ago). A young woman can watch an action movie or a romantic comedy, but when a young man watches a chick-flick what is he, gay?