Nobody "wears the pants" here. We have an equal partnership. I second Happy Mom's comment, there is nothing wrong a woman staying home and caring for the kids if she wants to. I'm a stay at home mother but that doesn't mean my husband is in charge. Nor does doing his share around the house and discussing major decisions with me make him "whipped".
That letter describes an abusive relationship, which is terrible whether the abuser is male or female. The response to it creates a false dichotomy by saying that one partner must be on top. That is simply not the case.
"Otherwise, before you know it, you'll be wearing a skirt around the house while dusting the furniture." That sentence reveals the writer's misogyny. To look like or behave like a woman is seen as degrading because he believes that to be a woman is degrading (to paraphrase Ian McEwan in The Cement Garden).
"Because like it or not, it is probably the only thing left in life that we men can still lay claim to."
Excuse me?! Last time I looked men still laid claim to an awful lot. Somebody needs to check his privelege!