It shocks me too that people have this amount of bad DF experiences.

I'm on Balmung, I run on the Aether server, I do at least 1-3 DF dungeons per day usually with my playtime and I have done this since I started and got to Sastasha a few days after open beta weekend. I played through all of 2.0. I've done DF EXs, DF coils, DF Steps of Faith within the first couple of days of its release, I did DF for all hard mode trials, all leveling trials/dungeons, and of course my daily roulettes (although I have always always always skipped Main Story roulette because I don't want to wait for people to watch cutscenes but I also realize it's unfair to make their first trips through CM and Prae awful).

I know there are plenty of people who have run more DF instances than I have due to playtime constraints but I have done a lot of them and I can think of 1 truly toxic experience (my first time running Ifrit EX when it was still pretty new, I'd just unlocked it and queued as WAR when I was still a pretty green WAR) and a small handful of times when a bit of snarkiness popped up. Other than that, almost all of my experiences have been neutral or good. It shocks me that people run into this so much.