People have very strong feelings about self-categorization, whether or not the person's feelings are "accurate". We struggled with accepting gay people. We're

People have very strong feelings about self-categorization, whether or not the person's feelings are "accurate". We struggled with accepting gay people. We're struggling now with accepting transgender people. In twenty years the big culture war might be about people who think they were born the wrong ethnicity, or otherkin, or some other area in which our failure to produce an indiscriminate society runs up against the rules of behavior to which we've limited them.