Since I first read this, I kept picturing it over and over in my head as though it were a comedy sketch or scene from a movie. (Person 1: "I'm transgender." Person 2: "I really like to be spanked." Person 3: "I'm heavily involved in the adult baby scene, and am wearing a diaper right now." Person 1: "Uhhh, good to know. Thanks for sharing, I guess?")
I feel like I've seen something that was pretty close to this at some point, maybe multiple times, but I really can't remember what. The only thing that occurred to me is a scene from near the end of the 90's movie Airheads (Brendan Fraser, Adam Sandler, Steve Buscemi, etc). The main character has a reveal that he used to be a nerd, and the crowd chimes in for support with their own personal pasts of being less than cool ("I used to play D&D too!"). And then there is one guy who goes waaaay too personal and misses the point entirely. Not quite the same, bit similar, though don't think it is what I am mostly thinking of, as I feel as though I've seen something dealing specifically with escalating fetishes and it's driving me nuts I can't remember what it was.