This is reason to not like her politics. But it doesn't say anything negative about her character.
This seems to be a distinction a lot of people miss. I think Hillary's probably a decent person at heart; I don't like her political stances much but the only character flaws I see, really, are that she wasn't insistent enough as SecState on the handling of classified material. And that's pretty minor; it would've warranted replacing her, at the time, but that's it. A mistake, not a massive character failure.
Conversely, I like Bernie Sanders' political stances, but I think pretty little of his character, for a bunch of reasons I've gone over in other threads.
Hating Hillary Clinton is just . . . insane to me. I don't see what drives the venom, at all. Reasons to want someone else to lead the party, sure. But that's it.
It's particularly silly when she's not even running. The only people who should still give a shit about Clinton are crazy Republicans trying to re-run the 2016 campaign.