I don't know but the healer shouldn't be an outright jerk like that.
Even if you were doing something wrong, like standing in AOEs or hitting the wrong mobs, etc, the healer should do his best to keep the pt alive.
You seem like the type who would listen to others in a dungeon - as evidenced by you being here and asking for help- so if you were doing something wrong the healer should have tried to help you out instead of behaving like a princess.