Yeah I was playing with a Random last week, Normal Raid. We were running through it fairly easily, until Warpriest where there were some botches so he began to pretty much call everyone on the team Sh!t, not directly at them, but indirectly. Just little digs here and there. Well after a bit people started dropping and he didn't get why. He kept asking why are people dropping, we almost have this. Whenever he messed up which was often he never took blame, it was always someone else's fault. So frustrating. I eventually left too and did it quickly with another random group. I feel your pain OP.