I had met all types of tank so far, from the really nice ones that taught me how to play my job and how to pass through a dungeon and didn't yell at me for failing at first try form tanks that say I just suck at the end but never told me what the hell I was doing wrong or just plain abandoned duty without any notice. But I also met DPS that thought they could just tank stuff because healer will heal them non-stop and healers that were as douchebags as any of the other classes, so I guess it's not about tank mentality only, it is about how different people deal with each situation.