I am going to to participate in a discussion about women in academia, organized by the group "Feminists at Brown", but do not have much to say about discrimination against women in academia. I am not aware of having experienced it.
However, once, when I was a beginning researcher, I gave a talk at a Dimacs workshop. After the talk, a senior researcher came to me. I waited for him to speak up, eager to hear what he thought of my work and of my talk. He opened his mouth and said: "I liked your talk. You have a nice shirt." I stared at him blankly, too disconcerted to know what to say. In that context, it was quite an offensive comment.
Many years passed before I took my revenge. A couple of years ago I heard Costis Daskalakis, then a beginning researcher, give a talk at a conference. Afterwards, we happened to take the elevator together. I turned to him, smiled and said sweetly: "I liked your talk. You have a nice shirt." He stared at me blankly, disconcerted, not knowing what to say.
How satisfying it is to be mean sometimes. Now there is one more man in the world who has experienced how things are sometimes for women. Sweet is revenge!