I've dropped a few dungeons before too. If I've gone out of my way to explain things, to try to improve the situation and it's not improving based upon the attitude of the player. Then your darn tootin' that i'll drop that duty like a bad habit. I don't join DF to give handouts and neither should anyone else.

That's not to say that I drop when someone just meets the gear requirement or I can see that they are attempting to correct mistakes ( I actually commendate based on this), but I will not settle for somebody wasting 15 minutes extra of my time because they are tired, or hungry, or they already raided, etc.