While I agree with you that is not that hard to believe (for the very same reasons you listed), your second reason is concerning.
"Some people automatically downgrade votes because the woman is in a certain profession thus she is beneath contempt in their eyes."
We're here to appreciate (and judge?) feet, not people and their careers/lives. Anything but the way a woman's foot looks, how they are presented and how they're taken care of, should not influence a rating.
I don't even know why I'm typing this, it's not like people are going to change because of it...