Some of those fields, esp. the ones with the worst ratio of males/females like phil of physics, are simply cesspools of antagonistic sexism. Not everyone in such fields is sexist, true; but you only need something like 1/3 or so of the people around to honestly not ever hear the words that come out of your mouth, good or bad, in order to find the field intolerable. This is older profs, grads, all kinds of people who of course never notice the sexism because they really were not listening to what you said in the first place, and so did not notice that you got completely ignored.
This gives me an idea for game. Let's call it Women in Philosophy Hang-Man. Say you're sitting through the questions after a talk. Then what you do is, you write down one segment of your hang-man guy every time a man interrupts a woman while she's talking. When you've made the whole noose and the whole hanging guy, you know philosophy's sometimes really shitty for women!