Younger players with high pitch voices screaming in VOIP.
People generally being very loud or reciting idiotic quotes in VOIP.
People who take an asset you're obviously using with youre squad (especially hate it when they take it and get it blown up in 5 seconds or a squad member is still in the vehicle!)
People who join a squad for a sniper kit then leave
Muttrah City where 7 squads load up for Transport
People who call in lase and expect you to magically know where it is, then yell when you don't help
Commanders who ignore you
Squad members who run off doing their own thing too often and usually getting killed because of ramboing.
Blue guys giving away your position when you're trying to sneak
Friendlies firing on friendly vehicles.
People who request a helo extract and pop smoke but their squad is so spread out by the time they're loaded you're already hat'd
People who dont want to stay on defence or get bored and leave defence without telling th rest of the team (I often keep my own squad as defence to compensate for this)
A lone tank rolling off to war. Tanks should travel in at least a 2. usually best for 2 squads to group as 4 tanks, 1 AAV and 1 logi.
Attack helo pilots who fly at around 50 meters off the ground just to be hit by a tank.
People who accuse you of hacking because you managed to single handedly wipe out and entire squad or found a cache through luck.
People who use big red to kill 3 infantry units instead of going after bigger targets.
Insurgents who actively attack the enemy as in engaging them on open ground from 300 meters away instead of waiting in ambush
People who type up the cache location
Team switchers
Team Switchers who gave away enemy locations
People on your team in a chat program with their friends giving them your positions.
When APC's don't give transport because they want to go rape up infantry
People who camp firebases or hideouts but dont attempt to destroy it, instead just padding for kills.
people who scream in allchat because somebody else took an asset that wasn't being used because their squad is called "A10 CAS" and this immediatly means it's theirs.
people who don't have a microphone
People who chat spam
people who wont give you a second chance or think you're a bad SL because your squad was ambushed, this is obviously immediatly your fault and you dont deserve anything.
people who run others over or circle around to run you over.
THose who use humvees as personal transport to abandon them in stupid locations
Rage quitters (I've done it myself ebfore and thusly I do hate myself

)
People who refuse to go medic "player 1 you take medic" "No." "Player 1, take medic." "Jsut spawned, already rifleman." "Go to the supply crates and get medic." "I got LAT"
people who take kits from supply crates without asking their squad leaders permission.
people who treat PR like an arcade game of running in on fulyl automatic, dying and doing it again then complaining everybody hacks.
people who TK you so their friend can take your kit
People who take your squads LMG or medic and wont give it up when you ask nicely
People that jsut start speaking to commander without requesting permission to speak or saying what squad they are.
I could go on....