Re. hatred of Clinton, ChooChoo - as Bigly says, a large part of it is good ol' fashioned common or garden misogyny.
But she was also Hawkish on defence, and the Republicans were able to spin this as "she'll take us to war in Syria" (unlike trusting a man with the mental capacity of a rather dim, unusually temper-tantrum prone toddler with the nuclear codes - that was a great idea, wasn't it?) There was also the lingering whiff of nepotism and political dynasty building (only there because Bill had been president before her). And then there was the private server - again, the Republicans were able to spin this as being much worse than it was.
Then there were the things she failed to do, and near the top of that list I'd say was failing to connect with the black vote. I have talked to black friends in the US who've said they perceive her as being either ineffectual on race, or in fact read both the Clintons as kind of laissez-faire, under the radar (as opposed to in your face) racists. Even if this is not a representative sample (and as a white Brit I am not in a position to comment), the published stats certainly show that it wasn't so much that Trump got more of his supporters out to vote, but that Hillary got less of hers out, and that fall-off in voting numbers was particularly pronounced in the black community.
I also know a few democrats who said they couldn't bring themselves to vote for her (see reasons above about Republican disinformation over hawkishness, e-mail server etc.) and voted independent. One friend who did vote for her, who always volunteers on election day to drive registered voters to polling stations if they can't get there themselves told me she knew things were going tits up for the Democrats by early afternoon, because she hadn't had anyone take her up on the offer of a lift ("ride") to the polling station - normally she'd have done a half a dozen or so runs by that stage.