Healers are not expected to dps, thats just plain nonsense. If they help great, but otherwise if i tank or dps i do not make a fuss about it.
Besides it sounded like since dps may not of been avoiding stuff that you may of had your hands full healing.
You said they were in full 210 gear? Probably one of those players that "learned" how to dps from doing hunts or fates..... lol