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WEBFISHING PSA: IF YOU SEE A USER CALLED "GRINCHER" JOIN YOUR GAME, LEAVE IMMEDIATELY!!!!
(steamcommunity.com)
Seems like Grincher can corrupt save data. So, do not open any mail from Grincher, leave any room you see Grincher in, and do not join any room with a 1,000 player limit called "Grincher's Happy Room". This is not a joke.
Edit: Kicking Grincher from your game does not work, they are not affected by the kick action.
It's really freaky to experience it in-game. They keep joining my games, and they can't be kicked, so they just sit there, menacingly. As soon as I found out they could corrupt save data I just started leaving whenever they joined. It may or may not be true but I don't want to risk it.