Unclassy Players

I dont understand when you loose a game and a player writes things like this>?

GAME OVER - viktorkici vs. LargeBalls - viktorkici won by resignation (-7). Your new blitz rating is 1014.

viktorkici: hahahahaha mother f fu c k

Does this ever happen to anyone else>? I like to leave chat on to say gg or gl things like that or to meet new people, but it is almost a hastle because of people like this playing on here. No CLASS!