Littman's study hasn't been discredited though. It's been robustly critiqued, as one would expect for any research that advances a novel hypothesis. The main i

Littman's study hasn't been discredited though. It's been robustly critiqued, as one would expect for any research that advances a novel hypothesis. The main issue that people have with her study is that it challenges the often deeply held belief that a person's gender identity is innate; it hypothesises that there is a population of trans-identifying people who have adopted this identity via sociogenic means. By doing so, it calls into question the affirmation-only clinical approach that has been so ascendant in recent years. Challenging people's fundamental beliefs and practices on a topic is never going to be popular amongst those who hold such beliefs. This is why her research received such an intense backlash, and why activists are so keen to claim that it's been debunked and discredited, even when it hasn't.