Last week I was in a GDKP where 3 of our healers were pulling 11.5K HPS each (two pallies and a shaman at >11K, the disc priest was at about 10K if you include absorbs and the tree was lagging at like 7K) and the raid leader had the nerve to blame healers.
We
actually wiped because DPS weren't moving for Pact of the Darkfallen and people were stacking on top of each other for Bloodbolt Whirl.
And then we had an MC.
4 attempts later, same DPS failures, same blaming the healers. Fortunately, the RL wasn't completely stupid and decided to call it.
It's stuff like that which makes it really frustrating to play a healer sometimes. I'm a pally. Doing 11.5K HPS without Judgement of Light is really not particularly easy (at least not without going OOM in about 20 seconds). I'm doing the best I can, don't blame me for your DPS' lack of basic understanding.