The article was very sexist. He is not "part of the problem" because he was offended by it. Maybe you don't see how sexist it is because you were predisposed to agree with it.

EDIT: Direct quote from the article: "We live in a society that’s sexist in ways it doesn’t understand. One of the consequences is that men are extremely sensitive to being criticized by women. I think it threatens them in a very primal way, and male privilege makes them feel free to lash out."

Anyone is justified at being offended by that.