As there is another thread on the topic of "horror stories" ranging around every level and every bit of content, I think it's clear.
We need to stop healing the abusive elitists. They blame us for everything, and give us no credit when we save their sorry hides from their own stupidity.
Just keep your calm, and don't respond to them in any way except to "forget" to target them with any heals. Oh sure, they'll benefit from AoE heals, if they're lucky enough to be alive when you'll need to cast one.
You and your group will be far better off...far better capable of finishing your goal after they rage quit, so just make a point of letting them die. Put them in their place, and let their own words condemn them.
It's time the healers stood up to the abuse! Join me!