The AGP was a "polyamarous-pansexual" 30 something year old man who started HRT at 28. Let's call him John. I got to know John through a couple of friends that I did online tabletop gaming and storywriting with around 5 years ago. He had been friends with these people for about 10 years and was married to a non-binary identified, but completely feminine presenting woman. We (John and the couple friends I was much closer with) communicated through online group and private chat. The group chat was an utter hugbox concerning anything that had to do with his transition, the general far-left politics of everyone there aside. I myself unfortunately also took part in this. Being ignorant of trans-related topics, coming from a very conservative area but being a shitlib at the time, and my connection with these people being mostly online helped a great deal with that.
I believed him when he said his height went from 5'11 to 5'6. I believed him when he said he did have periods and just didn't "bleed". I ignored him when he started talking about "not being able to get out of subspace" in response to a picture I posted of myself to general chat. I said I understood when he came to me privately and started talking about how he wanted to fuck other people because his spouse didn't have the same drive as him. I sent "LOL

" when he texted me he was reading lesbian vampire porn at work. I read his "coming out" notice for his coworkers. We all coddled and encouraged him as much as we could, believing he was suffering enough already, being a transwoman who started her transition too late to pass completely. At least that's what I thought at the time.
Fast forward three and a half years where I am no longer a shitbrained useful idiot and don't talk to these people even a quarter of the amount I used to. I reconnect with another individual, an older dude with moderate views, who left the group chat almost two years earlier than I did, seeing where they were going with the far left politics. We talk and John comes up, the dude also having known John for multiple years, and still being in contact with individuals from the chat IRL. I ask how he's doing only to learn he was asked to leave the friend group after leaving his spouse and trying to take her car to fuck a dude that lived hundreds of miles away. He tried to take everything they shared and start a new life for himself, having one night stands because he never had his "slut phase" (as all true and honest women do). I also learn that he quit his very well-paying engineering job for a supervisor position in Starbucks because he wanted to be around inclusive people. He spent the last year at his old workplace making several women very uncomfortable by asking them for tampons when he was on his "period".
Now I had already practically left the friend group when I learned of all of this stuff but the older dude I talked to used to believe John was just a mentally unhealthy transwoman. After sharing the experiences I myself had with John, and talking about the information I learned from here, (especially explaining the Jessica Yaniv case and how John's obsession with tampons resembled his), he slowly came to the realization that John was just a man who transitioned for "all the wrong reasons". You find someone who is not completely brainwashed and give them only the bits that matter first. I could have talked about how much John had made me, a biological woman, uncomfortable as fuck in general first. I didn't. I saved that shit for the end of the conversation. The guy still uses she/her for John but is now aware of the fact that John never was and never will be a woman.