I cuss/swear at the game (in game) all the time - out hunting, at a table - I just let it fly. Fuck this, fuck that, bullshit, fucking retarded and so on. Usually when I get hit with multiple open rolls on maneuvers in a row and I watch my rolls come out negative 4 or 5 times in a row, that really pisses me off. Sure, it's a game, but fucking seriously? 5 negative rolls in a row.
Never have I ever had any warnings about foul language in game. Sounds like someone has a hard on for you. I don't envy you.