And not just because Clinton is a woman. But because of the sort of casual misogyny that Trump belts out on a regular basis (here's another small number of samples: http://www.huffingtonpost.com/entry/18-real-things-donald-trump-has-said-about-women_us_55d356a8e4b07addcb442023).
I don't want my daughter coming of age with him as the chief executive of the United States.