I wasn't the biggest supporter originally but I did agree with using preferred pronouns, and had a slight belief in a "feminine soul" sort of thing. However, when my brother trooned it started the red flags. Mostly because he was never feminine, and if I were to believe someone had a feminine soul, he would be one of the last people I'd guess. I had gay friends who had always been feminine/liked woman centric things, but never trooned. So it all went down from there.
Then, I met this man online who wanted to troon. I talked extensively to him as I was sort of edating him at the time. I heard his reasoning for it. It was completely porn fueled. He wanted to be a "dickgirl pornstar" amongst other obviously fetish fueled ideas. He also wanted me to change pronouns for him based on his mood, because sometimes he "felt like a girl" and sometimes not. Most likely based off when his dick was hard, of course. This ended when it was revealed to me how scary mentally ill he was and potentially dangerous, yet still I wasn't entirely a naysayers.
Finally it was a genderspecial man I had a brief fwb situation with. He sucked, seemed like a type to abuse physically, and got weird when I asked questions. When I asked if he was straight or whatever, he said he was queen. When I asked if he'd ever been with a man "born male, with a penis" of course he said no, but berated me for asking that way. He said I was saying "TERF" shit, which I had no idea what he was even talking about so it prompted me to research further. Of course I found out I'm not crazy, that there are a ton of troons just doing it because of their fetish, and everything clicked into place. The more people gaslit me about basic facts, lied to my face when confronted with evidence, the more obvious it became how illegitimate "trans rights" are.
Since then, I've had countless trannies straight up lieing about being fetishists or even admitting to it and attempting to downplay it. It's never been more obvious how abusive, delusional and narcissistic this cult is.