Writers and women writers

Every so often, I have a conversation with someone, usually a well-meaning man of above-average intelligence, about whether or not sexism is A Real Thing in 2013.  Yes, yes, it is.  And for today's example, I bring you wikipedia.  Go ahead and read it all.

 When sex is an important identifier only for women, not for men, that's sexism, folks. When women are systematically moved from the category "writer" to the category "woman writer," while men get to keep being called "writer" instead of "man writer," that's sexism too.