Tryhards
b3St Pl4yEr 3v3R
Horrid community
Players that never use teamwork and then blame their team when they lose
Whiners
Ragehards
Hackers
Players that help other players on their team that are hacking
Last two above all else, I was on a TF2 server about a week ago and a hacker joins. This was on an unmodded server and every shot he fired was a crit. On top of that, another player couldn't go spy to backstab him because even if he had no way of knowing said spy was behind him, if that spy got too close, he would instantly snap around and shoot him. Just to make stuff worse, he had two Scunts running around with him helping to clear out any stray players that could even be a slight threat to him.