Oh god, where to begin?
Spies on DeGroot. Very few things scream asshole more, than a spy camping the top floor and stabbing anyone who comes up. How the fuck is it fun to spend round after round camping in the same spot doing nothing but left clicking when someone comes up and right clicking when they attack you?
When people join the server, see we have no medic, go spy, and tell us to get more medics. OH.MY.FUCKING.GOD.
Thirty two player Dustbowl, with more than eight engies on blu.... fucking really, guys?
That one guy who camps with stickies on blu, spamming "l8r" for every kill he gets.
The player you uber who chases down a sniper, doesn't give a fuck about the nest or anything else, just goes after the sniper.
THE GUY WHO TAUNTS DURING AN UBER AFTER KILLING ONE FUCKING PERSON.
That guy who rocket jumps out of the loading bay on third stage of Dustbowl, grabs the health and ammo, then taunts in front of the engie.
You heartless bastard....
The scout who constantly tries to bonk through the enemy team, getting ubersawed by the enemy medic every.fucking.time. Just feeding their team uber/kritz.
THIS.
http://cloud-2.steampowered.com/ugc/560966208462896893/950260D3EB186EDE97DC6B1F1F36FDB91A54DD22/ WHY, JUST WHY!
Excess of snipers in general.
http://cloud-2.steampowered.com/ugc/542946795874209693/6A62942BE90FB466C103B2043D8ACCB75166EA47/
That one guy in mvm who always readies up the instant the wave starts, didn't buy anything. Just readied up regardless.
There's more stuff, but I'm stopping now before I make an essay.