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"Calling a woman a "c*nt" is denying her brain, her intellect, her personality, her personhood."
I agree that using this term is trying to cut a woman down, but actually, the term is from the same root word as "cunning". Having a brain and using it while being female IS the offense in a sexist culture. You may disagree with Clinton's actions or politics, but if you respected a person as a person and simply disagreed with their voting record, it's unlikely you'd go that low and make such a T-shirt.
This is a pretty taboo term in our culture right now, I think most people will stop at "bitch" and many women have reclaimed that word. Hillary is advancing and she is successful, so the backlash is getting worse. That term hasn't surfaced in reference to her before she won in two state caucuses, now has it?