From what I understand a lot of feminists actually support other candidates and aren't all that thrilled with Hillary...
until all the hype starts up attacking Hillary, especially when it's the kinds of attacks that would not usually be so prevalent against men.
This gets them pissed and they vote for Hillary out of spite.

It's similar to how Coulter and Limbaugh complaining about McCain almost makes me want to vote for him.

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"It's never over... BOY!"
The Tall Man, Phantasm III