Why does heterosexuality violate the Categorical Imperative?
It's tongue in cheek and probably more of a diss against Kant than heterosexuality. It's more like "gender norms violate the categorical imperative common moral instinct that literally every rule should be literally identical for literally every person."
One of the longer-running sideplots of this blog that has been gradually buried under the Tired Arc is "the experience of heterosexuality is fundamentally debasing, because it consists of people with the traits you like (who get praised for having the traits you like) refusing to love you until you turn yourself, with extreme prolonged effort, into the antithesis of those traits, and if your preferences are at all coherent and considered, you will hate that antithesis. This is a process of looking carefully in the mirror for any traces of things you might find redeeming in a sea of ugliness, and mercilessly annihilating them."
