Sexism, racism, blind R tribalism, and decades of conservative media blitz against the Clintons, leading to even a lot of liberals and leftists absorbing some of the right-wing hatred via cultural osmosis. (There were so many Americans I saw on the 'net in 2016, who disliked Hillary Clinton and thought her unsuited for the Presidency, who couldn’t actually give any rational reasons for their feelings when pressed.)
Also, just because one imagines a DNC conspiracy, doesn’t mean it did happen.
