The clown with this Steam profile is a real piece of work:

https://steamcommunity.com/id/letwiggyS_/

He sets up a dedicated server running expert mode L4D2 games. Then he joins the game on his own server and team kills / griefs everyone who joins. He gets kicked off by vote, changes his player name, and then rejoins the same game to grief the players again. I don't recall if it's an exploit or a server console command that lets him re-join, but I digress. He isn't so clever because the URL to his Steam profile remains the same. I blocked him on Steam, so he gets pissed because the block prevents him from from rejoining the game. He then he kicks me from his server. with the message, "only a--holes block people." Actually, only a--holes grief people. What a mental case.