Sexism is interesting because it's pretty different from other discrimination. With racism, homophobia, xenophobia, etc, the issue is that people are different. If a black person acts like a white person, a gay guy doesn't talk about his sex life, or an immigrant acts like a 100% assimilated native born, then all those things are seen as an improvement. They can be considered one of the good ones. These types of discrimination are a desire for these people to just not exist, and failing that to be as non-prominent as possible.

With sexism, though, it's more often about trying to uphold the differences. To stick to their defined roles, not to act more male. When a woman doesn't do that, like Hillary Clinton for example, people lash out.

I think that's why black people got the vote before women, and why we had a landslide victory for a black president 12 years ago but being a woman is still seen as a major handicap to presidential electability.