Those guys are just complete idiots, or the DRKs they met are simply BAD. I have my bismarck ex clear and I also have my Ravana EX clear, heck I have even gotten my Hive Claymore now. And 4 out of those 10 clears was me solo tanking, and the other 6 was me OT'ing as DRK (Ravana Ex). Kicking you for being a DRK in Bismarck EX? I call bs.