This is what happened to a friend and classmate of mine who transitioned FtM in the 1990s, and that was back when they actually still carefully vetted people. "He" didn't try to foist any of the gender ideology stuff on us. He just told friends that he was changing his name. Fast-forward 20 years, and his(her) body developed bad reactions to testosterone, so he had to stop it. He told me that he thought transition had been a mistake and that he was still dealing with the same issues he had before. But he was known academically as a trans-male and knew he would be hated if he detransitioned, so he ended up committing suicide.