A couple excerpts:
To a woman who has internalized this point of view, Sarah Palin's opposition to abortion rights is a personal affront, and a deep one. It doesn't help that Palin lives by her beliefs. To the contrary, it intensifies the offense.
Liberal men put down Palin as a cheap way to score points with the women in their lives, or they use her as an outlet for more-general misogynistic impulses that would otherwise be socially unacceptable to express.
Update: Another attempt, at neo-neocon, with a long and mostly serious string of comments. My summary of the thread--some people perceive Palin as uppity and they do not care for uppity women.
The level of Palin hate is a most interesting phenomenon, one that cries out for an explanation. It tells us something about human nature, but I am not sure what.