They describe themselves as lifelong, liberal Democrats, but the makers of a documentary about the difficulties of people who transitioned from one gender to another and back have found themselves branded as bigots and anti-trans grifters as well as TERFs—short for Trans-Exclusionary Radical Feminists. They said a screening of Affirmation Generation had been canceled due to pushback from trans rights activists—including threats of disruption and social media attacks, and another required extra security and a secret location. Some of the film's makers say they did not dare use their own names. "If Hollywood knew I made this movie, I would...