The title is slightly tongue in cheek. And yet, what better way to reinforce the patriarchy than to make fun of a boy for listening to 'girl music'? You get to reinforce gender stereotypes all around, and also get to take a little boy who already wants to be the meanest person around and make him feel ashamed! (Click to enlarge.)
Once again, this is in some ways a silly little thing--just a comic in the paper. But this is a perfect example of the sort of actions that men do to other men (and that fathers, uncles and grandfathers) to reinforce sexist attitudes.