I think it was attempting to be funny, it wasn't very funny, but I am not offended. How many women tell man jokes? A lot so it goes both ways.
What I don't understand is why women keep making themselves different from men, and then expect equal treatment. What kind of passive aggressive bullshit is it to not go to work for a day to make sure your male coworkers get screwed over by having to fill in, and then want to be treated equally. I am a woman and it makes no sense to me.