I really wish we had gotten more of an exploration for this line. I really loved that he did refuse, but it also engenders so many questions.
Why exactly did Kurt not want to play Frankenfurter?
Was he uncomfortable with wearing drag? Was he uncomfortable with showing that much skin? Was he uncomfortable with opening himself to even more bullying by playing a transgendered character? Was he irritated with Schue for assuming that he would play it? All of the above and then some?