I don't run DF much, mostly all people from my server via a few Linkshells and the FC. But in my experience, if you are the tank, no one talks crap to you much because they don't want you to leave and make them wait hours for a que again, and getting a tank replacement on a run is likely not going to happen because they uncheck "runs in progress". As such a lot of tanks abuse their staying power and act like complete $%#@. I am not one such tank, but yeah.

Personally I take Duty Finder with a grain of salt. It's a luxury feature of the game and you shouldn't depend on it. It is really easy to form a linkshell for level 50 only players and get runs for castrum together with the duty finder because everyone needs to farm castrum.

In fact when I made my linkshell and shouted for level 50 members for CM and AK farming, I had 30 members in less than 10 minutes and in castrum 10 minutes later. Now we've done chimera, hydra, ak a ton, castrum, HM Ifrit, etc etc.