Honestly this all just stems to no players should act entitled at all, regardless of their role. You're going to eventually end up playing with a rude jerk in every role who thinks because they're stuck doing DF they should get preferential treatment.

I wasn't there so I don't know just how hostile it was, but we also have to remember that due to DF's general nature if you want to communicate to your party before they take off, you have to do it quickly and in as few words as possible with most parties. I mean, we have healers who have to chase down tanks just to apply buffs because they take off the second people skip their opening scenes without saying a word. We also have console players who can't type as easily. So it's very possible that just because someone forgot "please" doesn't necessarily they're demanding that you do what they want. That could literally be them expressing what they're hoping for before risking a hasty tank just zoom down the hall.

I'm not saying you yourself are prone to doing that, but because that is a very common behavior of tanks that could have been part of it. Or it could be part of the reasons behind communicating that way if you run into this again in the future.

Now if they were truly being horrid party mates, which to make you this angry I'm sure they were, next time just vote to kick or leave the party and cue again. Obviously talk it out first, but even as DPS I would rather take another 42 minute cue than deal with someone being obnoxious on purpose.