Josh Whedon, the writer of Roseanne, Buffy the Vampire Slayer and Toy Story, was asked this question during an interview. Contemporary or "modern sexism" suggests that we have been wired to expect to see certain people in certain positions. A question like this reinforces the societal belief that men are expected to be seen in several positions, while women are dismissed.
I saw this castle episode and died laughing. I replayed it because I loved it so much. If you ever watch his series castle, he actually gets a few good jabs in about firefly and what's even cooler, some of the firefly cast make guest appearances. "That Joss Whedon show."
Equality is not a concept. It's not something we should be striving for. It's a necessity. Equality is life gravity. We need it to stand on this earth as men & women & the misogyny that is in every culture is not a true part of the human condition. It is life out of balance & that imbalance is sucking something out of the soul of ever man & woman who's confronted with it. We need equality. Kinda now. - Joss Whedon #quotes