100% OP's fault.

By pulling mobs as a role not designed to do so, YOU added to the stress of the dungeon run and could have potentially wiped the party if the tank and healer were not prepared. The tank may have been a PS3/PS4 user with no keyboard, hence the lack of response.

Duty Finder does not entitle you to a full run, nor does it entitle you to a speed run. It entitles you to three other players to run the dungeon with, and how the party goes about the run is a party decision, not the decision of some DPS who wants to pull mobs for the tank.