If someone asks the tank to get everything, I think they should be obliged (As long as everyone's being polite, of course.) I think the issue here is that the OP was there for XP, and the tank was there for his daily.

When I tank, the first thing I do is ready check and say "Click ready if you want a full clear, click not ready if you want a speed run, my vote doesn't count." Then, I let the three of them vote so there aren't any ties. No fuss, no muss, we make an early decision and then get our business done like dignified adults pretending to be Knights and wizards.