My favorite of The 11 Most Politically Correct Moments on College Campuses in 2014 is #5: "Students opposed a female-to-male transgender candidate for class diversity officer because he’s a white man." I keep thinking trans politics will break identitarianism. Had a white male-to-female trans woman run, would she also have been unacceptable because she had been a white man?
To be as clear as possible, I fully support everyone's right to claim the gender that makes them happy. But identitarianism breaks down when it tries to include trans people as a social identity, because identitarianism assumes you are what society sees you as, while trans people believe they are what they feel they are.