Sexism wasn't really that big of a part of Trump's campaign. It was mostly racism and xenophobia. Hillary's campaign was largely about her sex.
Hillary using her status as a woman as a campaign strategy isn't sexism, though. It's a fact that there's never been a woman president. It's a fact that women have been oppressed historically. It's a fact that not that long ago women couldn't even vote or become senators. It's significant then that she was a woman, and it would have been obtuse to ignore that.
All of these things have significant political merit and pointing them out or using them as a part of your strategy is not sexism.
It would have been sexism if her strategy was more like "don't vote for a man", or "he's a man, he doesn't know what he's talking about".
It is absolutely sexism. Whether you think it is a good or bad thing is another issue. ---
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