I dont mean to offend the masses, but regretfully, in my experiences puging dungeons, more so than other classes tanks at times have a "hollier than thou" additude. As others have said, they have the luxury to do so, in how utterly in demand they are. This is a portion of why i mostly just run dungeons with friends.

Contrastingly, I dont think tanks are respected enough either, for how difficult the job is, and how quickly people will turn on you if you dont do it well or even perfect. Maybe if the community would respect/appreciate them more, this attidute would subside.