It's rude to question someone's gender identity.
Tommy's friend, Brent, surprises him by asking is he would view Brent differently if he knew Brent was really a woman.
Tommy has to formulate a response to Brent's question.
Tommy lets Brent know that his gender identity has no effect on their friendship, that he would respect his friend's identity completely.
Tommy tells Brent that the question is preposterous because he is obviously a man.
Brent feels more comfortable in his friendship with Tommy and Tommy feels good about his response to Brent’s question.
Brent feels offended and saddened that his friend does not respect his identity and Tommy regrets saying something hurtful to his friend.