PMS and Polotics

I really enjoy my Anthropology class on Women's studies but I was enraged today when we were compiling a list of stereotypical male and female traits.  We got on the topic of PMS and someone brought up that one of the reasons behind Hillary Clinton not being president or possibly never becoming president was because many men believed during PMS she would be unstable and too emotional to make decisions.  Not being as politically intrigued as I wish I was this came as news to me and something I have never heard of before.  Who in their right mind would not choose a female because of that reason, it just seems so ignorant and sexist to me but maybe I am outraged for no reason.  Yes, PMS obviously brings hormones to the female body that can cause emotions and behaviors that would not when menstruation is not occurring but it does not mean they can not be under control or handled by the woman in charge.  I swear by the end of this Anthro. course I might be more feministic and I am not sure if that is a good or bad thing.  Just wanted to share my frustrations with this particular topic...share your thoughts please!