I made a smurf account and pretended to be a ten-year-old named Aiden, for a survey for my online class.
Hopped into a game, and started telling people it was my birthday, and doing my best imitation of a ten-year-old.
My initial hypothesis was that I'd get flamed to hell and back, but no, everyone was actually civil.
Three people wished me happy birthday and told me how good I was at the game (Hint, I wasn't.) and no one said anything inappropriate in chat.