There's a common name for bards like that in MMO's - Huntard.

Healer dps can help clear the dungeons almost twice as fast. Anyone who rejects that opportunity should just simply uninstall the game. OP's story reminds me of a encounter I had with another silly premade in DF. It was a tank and two BLMs. I told the tank to do a large pull. He was really bad with keeping up threat, but I healed through it anyway. But then I noticed it was taking forever to clear the pull because the two BLMs were doing single target dps on a dozen enemies.... I was like what the heck, where's your aoe? Their response "bah bah don't tell us what to do". Riiiight, left the party afterwards. You don't negotiate with scrubs.