There are those on the left that are too PC quite obviously and those that are no better than those they supposedly abhor (Berkeley, Evergreen, etc). But they are probably a bit on the fringe-ish side and are located in areas that are pretty liberal anyway. I know some Googlers and the number of pronouns they need to know there is just patently stupid, but that's silicon valley not every state that went to Hillary.
Mostly, the right is fighting a caricature of the left and the right has better marketing as they appeal to fundamental aspects of human nature such as tribalism, fear, and anger. The right is far better at team ball and uniting behind scumbags like Donald even though many I know on that side of the aisle thought he was pathetic during the primaries (they all ended up voting for him). The left has a big tent that is not nearly as unified. I know a lot of misguided Bernie supporters that didn't vote for scumbag Hillary.
Toss those factors in with the fact that the democrats throw up an institutional player, voting policies that favor citizens in Wyoming over California, and the fact that people prefer party over reality and a completely unqualified reality TV star gets elected and turns the white house into reality TV. Says more about us than the left or right or Donald.