I got told this once in a pug Stone Vigil. As background, the tank only spoke Japanese and couldn't hold threat on more than one mob (probably because all she did was her single-target rotation on the one mob, and flash to hold the rest, which predictably didn't work).

So we were doing the pull with the 3 Avies, and the tank died because she had 1 of the Avies (and was taking ridiculous damage for only having ONE mob), and I had the other two (which I couldn't Repose, of course), and I couldn't keep both myself and her alive through the damage.

DPS (I forget what class he was) was yelling at me for being a bad healer for not keeping the tank up. I guess he missed the other mobs beating on my face? I told him he could heal himself, since he was so good at it, and proceeded to not cast a single AoE spell for the rest of the dungeon, nor heal him directly at all. Every time he died, I left him dead and refused to raise him.

Which probably makes me a really mean person, but that dungeon was absolute hell and I was too busy tanking all the things the tank apparently didn't know how to tank.