People don't like Trump because he is a racist, sexist, egomaniac who wants to Make America Great Again -Now With More Fascism! People don't like Clinton because she's a woman who doesn't give them a warm fuzzy feeling, and whose strong leadership qualities, which they would admire in any dude candidate, make them anxious and confused because they are attached to a Person Of Vagina.
People don't like Trump because they recognize him as the populist threat to democracy the Founding Fathers fretted over. People don't like Clinton because they are more comfortable with an old dude spouting fiery socialist rhetoric than a (less) old woman proposing thoughtful policies to advance the welfare of women and families.
People don't like Trump because he's tearing down an established party, running roughshod over that party's longstanding cherished policies and principles, and doing his level best to destroy any remaining shreds of respect not just for party leaders but for the concepts of experience, expertise, knowledge, logic, democracy, nonviolence, and civil rights. (Even if one can argue that Trump is merely reaping what the GOP has sown for years now, nothing says the sowers have to like the result any more than the rest of us.) People don't like Clinton because, you know, she's certainly qualified to be president, but, well, she's stiff, she's old, she's unattractive, she shouts/shrieks/cackles, she has that hair/those pantsuits/those cankles, her only qualification [besides the Senate and Secretary of State experience] is being married to Bill.
People like Trump because he's a filthy rich New Yorker who says he knows how Wall Street works and who disrespects women. People dislike Clinton because they suspect her of being filthy rich and hanging with people on Wall Street. And people dislike Clinton despite her promotion of women-centric policy issues [either because they are anti-women or because "she doesn't speak for women". You know, the way Bernie does.]
When the press talks about Trump and Clinton being the two most unlikable presidential candidates ever in the recorded history of time, about how people are just having to choose between who they dislike the least, it obscures serious and meaningful differences. If Bernie's supporters can't bring themselves around to voting for Clinton in the fall, it doesn't mean they are standing true to their principles or trying to bring about a revolution. It means they would be more comfortable with American-style populist fascism than with a democratic leader who shares many but not all of their policy goals, but who happens to be female.