I have a really long fuse, but when it goes off, that's it! I've been playing since November and I have never quit a dungeon before, and I've played all jobs and roles and had my patience tested at many points.
This is probably pretty silly, but I just did not want to deal with it.
Joined leveling roulette on Monday, my day off, with my AST. My AST is a fresh 50 that I'm trying to catch up to my 52 WHM and 52 SCH, so I'm hardly new to healing though it is an alt-alt job for me. (Main WAR/alt DRG)
Frankly I'd been hoping for a higher level dungeon, but I got Copperbell Mines. Okay, no problem, it's an easy dungeon and I can dps to help make the run faster, right?
We go into the first pull and things are fine. I'm adding dots to all the mobs before I go and heal, then alternating heals and dps. We destroy the first group no problem and move on.
Second group takes longer to get through and I notice that the ACN isn't putting their dots on all the mobs. I am dotting all the mobs, healing, and dpsing, so I figure okay, they're a sprout, maybe they don't know. So we finish that group and I say, You should put your dots on all the mobs so that they die faster.
They sassed back with, I'm busy healing the tank while you let them die.
This takes me aback because the tank was never anywhere near dying; they got about halfway down, which is fine because I can switch to them after a round of dps and Benefic them to full. So I reply, If you want to backseat heal, I can leave.
By this point we've moved into the next group and I'm dpsing and healing again. The ACN retorts, You're backseat gaming me, so.
That was the point I shut down. I offered a tip and he insulted my healing. I healed them through the rest of that pull and calmly went up to duty finder and dropped. He was wrong on three levels (not dotting all mobs; trying to overheal tank; thinking the healer shouldn't dps if they can) and I just did not want to deal with that attitude so I left.
Was it pretty stupid? Probably. I got Thousand Maws on AST later that day with seasoned dps and a new tank - funnily enough there was another ACN but she had the Pure White title. And yet she, too, wasn't dotting all the mobs. I kept my mouth shut, kept everyone alive, dpsed and dotted where I could, and we sailed through just fine.
I am the kind of person who will put up with repeated wipes to get the group through. But that kind of attitude, I just don't get it. There's a big difference between backseat gaming and offering a tip for someone who may not know everything about their job.