hahaha this is the story of my life as a white mage! It has happened to me numerous times! I was once in Brayflox trying the get the last pieces of my battlemage set (I had done the dungeon many times), and I got a party where the tank didn't feel like avoiding aoe attacks so he got killed many times, and started complaining, I told him I was fine with healing him, and then he said I didn't like him, so that's why I let him die XD OMG I got fed up, so I said sorry, and that I didn't have anything against him but couldn't go on so I left the DF.
Another time, and probably the worst experience was my first and only run through Stone Vigil where the tank wasn't pulling hate so every enemy went after me. We died a lot, but good thing nor the dps or the tank blame me, but we went like that the whole dungeon!!!
I think some people should learn about what their role really is, and not only depend on the healer to heal each hit they receive!