Speaking of Eden Titan, I was doing that one yesterday to get the materials for a Deepshadow weapon, and...
I was healing with my partner, and somehow every single DPS died at least 4-5 times. We didn't wipe, but there was always at least one DPS dead because they refused to learn the mechanics after dying the first time. There was a few points when it was just us and the tanks, despite our best efforts to keep the DPS alive (turns out you can't heal through one-shots, who knew). I mentioned as it ended that I'd never seen so many DPS die in that fight, and one of the tanks quickly spat out a line about a healer complaining about doing their job before quickly running out of the duty before I even had time to read what they said. I wasn't even complaining, I was just stating an observation. And it wasn't even about them! Talk about sensitive.