HRC only very recently came to support same sex marriage, after it was a sure-fire winning issue. In the past she has called for a wall between the US and Mexico, she uses race baiting language to make white voters feel that she'll be tough on crime, and her remarks justifying neoconservative foreign policy are very disrespectful of the citizens (typically brown-skinned) of the nations the US attacks.
HRC is strongly supported by the banking and finance industry, as well as by essentially all large, establishment industry groups. This is the definition of conservatism, preserving the status quo.
HRC also focuses very much on American exceptionalism and makes a moralistic argument for US foreign policy. She's presided over the largest arms deal in the history of the world, selling US arms to Saudi Arabia.
She wishes for the US to be the world hegemon and to use drone strikes (terrorism) to intimidate and subjugate the (often) brown-skinned people who might try to prevent that.
As we've seen via Wikileaks, HRC has used her and WJC's considerable political influence to amass a fortune exceeding a quarter of a billion dollars. She's advocated most of the economic policies that the super-rich want most. Some of these are, frankly, good policies, but many are handouts and loopholes that help preserve the status quo at the expense of those on the bottom and in the middle.
I would never vote for Donald Trump, but I would also never vote for HRC for many of the same reasons that prevent me from voting for someone like Trump or George W. Bush, etc.
As we've seen with Wikileaks, HRC despises the Sanders voters and strategized not just to sabotage Sanders' candidacy by installing her own cronies in the DNC, but also by pretending to care about their issues while telling banks the opposite. Not only is HRC a political pragmatist, she's on record actively trying to stop the only moderately successful leftist political movement in the US (Sanders) and joking about it to bankers!
Voting for HRC because she's a woman evokes a tribal instinct that is on the same level as voting for someone because they are white. We all want a world of equal rights and we all want to respect powerful, even flawed, leaders whether they are male or female. But HRC goes way too far with the sabotage of Sanders' campaign and the warmongering. Thus I believe voting for HRC (or Trump) is an unconscionable act.