While an argument can me made about a sexist perception (a "woman liar" being perceived more harshly than a "male liar"), I think it's not just that.
What many of us, myself including, don't like about Trump might have been his biggest asset on this particular question. His "I don't give a f**k" attitude may cause outrage, but seems genuine. Clinton long struggled to be perceived as... I don't know how to put this? Authentic?
I'm not sure why I forgot that one ("authentic"). That was another one of her biggest liabilities. This was a big deal in an election where people were tired of politicians just saying whatever they thought people wanted to hear. They craved authenticity, and this applies to both sides. Ironically they chose Trump, whose 'telling it like it is' behavior was just 'telling them what they want to hear, on steroids.' Exactly what they didn't want.
Amazing how the DNC no doubt understood many of Hillary's issues and yet still cleared the way for her. Their ranks need to be thoroughly cleansed of anyone who still thinks picking favorites and doing all they can to dissuade challengers is acceptable behavior even after this election.