It's your right to vote for whomever you want in the primary. The main concern is really not the primary so much as the general election; if Hillary is the nominee, and she still doesn't represent your beliefs as well as her Republican opponent, well then the issue wouldn't really be Hillary Clinton.
What has been objectionable to me these past few months is the sheer amount of lies about and vilification of Hillary because she happens to be the opponent of who many GAF posters support. There's all sorts of subtle, unconscious sexism that just slips by and is not called out because other posters support the same arguments of fakeness, of corporate puppetry, of corruption, of whatever that they don't pull out proof for. It's largely based on the passion and emotion of investment into a competition. Hillary could put out a good idea (she recently revealed a plan for autism that was praised by the autism community, yet on GAF there are threads about her social media outreach instead) and either no one notices or if there are threads, there would be drive bys with the same old arguments listed above.
It's exhausting to see ignorant post after ignorant post ("She's a 180 from Obama" "How is she more liberal than Obama?") to idiot post after idiot post ("She's not cool" "She's fake") to posts that are just plain bitter about Hillary, because she planned and worked out her run and campaign earlier and better than her opponents did, and therefore it's been difficult for her opponents to gain on her. They blame the system, they blame the party, they blame Hillary, they blame everyone but themselves for not voting in 2010 or 2014, for their own apathy. If the only way one can vote for a candidate is if they are enthused by said candidate, what makes them better than the people who voted for George Bush because they wanted someone they could have a beer with?
The absolute worst thing about all of this is that I thought the left was above the petty shit that the right does when it comes to Obama and Hillary. After all these years of shit piled on Obama by conservatives, you would think that they're able to recognize such poor behavior and media issues, and be above it all.