I probably missed the whole point, but where does the sexism aspect occur in all of this? This is an argument where by chance a man and a woman are involved. This time a man is in a "theoretically" higher position(working as editor for nature) than the woman. Does this fact alone determine him to be sexist?
I realize he "outed" her and I see by her post that she is not handling that herself too well. In my eyes both of these people can learn a lot about professionalism.