The exact same thing happened to me yesterday during msq roulette. WHM DC'ed right away after we got Castrum and came back some time after we beat the first magitek boss. He then went AFK until I've had enough and brought it up after the invul giant phase. He was kicked promptly after, but the real deal happened afterwards. DNC kept saying on how easy Castrum is and it doesn't matter, that she has seen 2 people carried the other 6 through the dungeon because it's "so braindead EZ", and that I'm a jerk for "whining and crying over 1 person AFK in a content that doesn't matter".
I'm almost impressed on the mental gymnastics required to be able to defend leeching behaviours like that. I thought this DNC was a special case, but your experience proved me wrong and some people actually do defend AFKing on duty. Like... if the content is so easy, I see no reason not being able to perform well. Sure Syrcus Tower is easy, yet just today in my run I had 1 healer 3 DPS died to Scylla for some reason (except for my fellow DRG, poor girl was frozen and didn't get any heal/fire orb).
