Misogyny and racism are two reasons.
The other reason is that democrats aren't really offering anything new and exciting this time around. They are for maybe the middle class and the rich won't like how much money is being 'taken' from them.
Their politics aren't that great either, they are supporting a genocide just as much as republicans would.
It's pretty much just being against strong fascism at this point and that's all they have to run on.