I bought a birthday card today, and there actually was a card there under the heading of: "Grammar Police." It was so funny - playing on the wrong use of your and you're.
Of course it was a woman criticizing a man. I suppose they didn't know which route to take. If the woman had been the offender, then women would say, "It's always the woman who is stupid." But this way they'll say, "It's always the woman who's the bitch."