I usually have good experiences, but last night we were doing a CM run for a fresh 50 and so we were gonna let him watch cutscenes and not speed through. 7 people from the FC and we got a DF BLM. Right away we tell him this is not a speed run as we have a first timer. He replies with "Awesome". At that time we didn't realize that was a sarcastic response. So, we then start explaining to the new guy the mechanics of the first pull(he's a PLD). The BLM says, "You are also going to explain shit?" and quits. We just shook our virtual heads, got another BLM replacement right away who had no problems not doing a speed run. Our run took 36 minutes.
My question is for a DPS, is it really worth not being patient to let someone new learn the dungeon and enjoy it his first time by accepting the 15 minute DF penalty and queueing up as a DPS again? How much faster than 36 minutes can you clear CM to make up for the 15 min penalty plus however long it takes a DPS to get the queue to pop? And why are there so many people who seem to take so much offense when there's a newbie in a dungeon?