Virginia Postrel hits the nail on the head at BloombergView:
Trump’s coalition certainly includes an element who are tired of being told that they’re worthless and awful — Won’t it be great when stupid white men are put in their place! — and are punching back, sometimes in deplorable ways. For them, voting for Trump is a way of combating political correctness. But it’s also a positive vote for someone they believe is proud of them and proud of their country.
Liberals want to turn Trump’s victory into an endorsement of racism and misogyny. That’s a dumb strategy if you’re against those things. The liberal belief that half the country is made up of horrible people is a big reason Trump got elected, and the more Democrats keep repeating it, the more likely their worst fears are to come true.