There should be a mini games chat filter. If there's someone young, and they're trying to have fun... Then you see someone say a cuss word.... They don't deserve to be introduced to them if they don't already know them. You could still bypass the filter, but it would be more difficult than just nothing.
Support. This is a very good suggestion and even if were to report someone cussing or saying kys the only punishment they would get from what I know is a warning in mini games.
To be honest, a chat filter isn't needed for minigames. It's actually nice to have some freedome w/ minigames. IMHO, the only problems in the chat are the trolls, racists, the bigots, and the sexist people. But let's be honest, that some people are too butthurt, though not all and people do have the right to offend, and be offended.
Support. I think that profanity should not be allowed on minigames or any other gamemode for that matter.