I think you can make a reasonably cogent argument for the overtly male overtones as merely a way to explore a kind of existentialism: Nietzsche particularly slanting toward his Dionysian style. To be Edward Norton is to be of the slave morality, the "slave to the Ikea nesting instinct"; to be Brad Pitt to be of the master morality, to be "free in all the ways you are not". (And then one argues about whether the film condones existentialism, condemns it, or condemns those who confuse it for nihilism).
But admittedly I haven't watched Fight Club in some years, and that essay is a while behind me.