You know what really grinds my gears?

[St0rmchild]

People playing like shit in 24man, not doing mechanics and vote dismissing the person that calls them out on it (after the inevitable wipe)
(Disclaimer: I don't res people failing easy mechanics/taking avoidable damage in 24 man and even warn people about that. )

[Fernosaur]

Summoners who use Virus when it's irrelevant and give the boss immunity for no reason. The road to hell is paved with good intentions

Also, Astrologians who overwrite their co-AST's expanded card buffs.

[HyoMinPark]

Also, Astrologians who overwrite their co-AST's expanded card buffs.

^^^^^^

Especially if they overwrite an Expanded Balance with something stupid like Expanded Spire. Is it that difficult to look at your buffs bar (or the freaking party list) and see that there's already a buff up. >.>

[kupokage]

Players in 24 man raids who will run with the raid to the next boss BUT THEN stands OUTSIDE the room with a "brb" and then pretend to get butthurt when they get locked out. Youre not fooling anyone. You never intended to participate in that fight, did you. Hoping someone would pull and lock you out so you can send out a "no ready check?" and pretend you had every intention to fight. Leeches.

[Driavna]

People that drag the loot rolls at the last boss hoping others will leave.

[RubenSnizzle]

Black mage that don't know their rotation.

[PArcher]

Oh boy.

Undergeared PLD or DRK who insist on MTing because I'm a WAR, and then lose aggro to a healer or DPS

Healers who would rather do nothing than DPS (except for very new healers)

DPS who refuse to AoE when appropriate, or who AoE on single targets (STOP USING DOTON ON ONE ENEMY NINJAS)

People who start "farm" parties looking to be carried

The worst players in a party winning the best loot (bonus points if they were AFK the entire time or knocked off ASAP)

NIN who overwrite Storm's Eye with Dancing Edge when there is no need to (AKA, applying it from flank or rear)

[whiteblade89]

Being in a party with another Ninja. I'm sorry but I hate having to coordinate who is going to use TA first. I usually tell whoever it is to do theirs first and then I put mine up right when theirs falls off. But then I have to trust that these people actually know their openers. Spoiler alert, they usually don't. I just need to start taking the first shot on that because normally it takes them forever to get their TA up when it shouldn't take more than a few seconds.

[ErikMynhier]

Entering any content and seeing one of the party decided to buck the norm and not use a Job Stone.

[Astyrah]

as SCH, in DF 8man trials hm/ex when a caster uses virus before that tank buster that i was saving my super virus for (not really a big issue but i could've just used adlo on the tank and spent the rest of the time dps-ing instead of having to follow up another heal after the TB when the regen from the co-healer could've taken cared of it) .... +points when it's the bootleg virus from non-ACN jobs