Because of her stance on abortion and the second amendment. That is two right off the bat. I also don't agree with universal healtcare, the redistribution of wealth, the belief of needing more government to regulate various things, higher taxes, open borders, the attack on mining and oil, etc.
Now, if you say those are not reasons for "hate" I would strongly disagree. But, she has been around and in my face with this crap since 1992. I am tired of her, and those like her. It has everything to do with what she stands for and the type of person she is, as well as what she has proven herself to be.