It's hard to even begin to list the things that make Hillary unlikable. It would be a massive list. Chief among them for me (and ironically, something I agree with Trump on) is that her facade of feminist warrior for justice flies in the face of her own history, with the way she helped to distance her husband from his sexual harrassment scandals (and in at least one case in the 70's, a likely rape) by disparaging victims and helping to lead the character assassinations of Bill's accusers. It flies in the face of everything a feminist would stand for. Yes, I understand that ideological obligations can fly in the face of marital realities. I get that a spouse needs to stick by their spouse above all others. But she could have done so in a way that wasn't so patently offensive. She could have 'stuck by' her man without defending his behavior. And she assuredly could have stood by Bill without attacking the character of his victims.
She is still miles better than Trump as a potential President, but as Stewart points out, being preferable to Trump would be equally true for any number of very awful and unqualified people.