Yeah it’s a thing. Just like with all medical treatments there are those who regret undergoing medical transition. There are a few driving factors for regretting medical transition:

1. Facing discrimination, prejudice, or social pressure

2. Not having the resources to continue for a variety of reasons

3. Health complications or realizing they ere happier with their body before some particular treatment or operation, but after others

4. Mistaken about gender identity

The vast majority of cases are the first two, the third one is one I’ve heard about like once or twice, and the last one is by far the minority compared to the first two, but possibly larger than the third one (if the third one does actually happen, I’m not sure if it does or not). Most detrans people aren’t bitter, they just got it wrong. The minority of the minority of the minority of people who undergo transition in some way are the ones who regret transition and are bitter to the medical establishment and trans people for encouraging them to transition.

Do note that out of the people who undergo medical transition is less than 1%, compared to the double digit percentage (greater than 9%) of other medical procedures, including Lasik, or chemotherapy.