It's rather a "You can talk in private in this room without any of the guests you don't know." but that doesn't mean you can talk trash about the house owner in that room and if you do and someone tells the owner you might get kicked out. Only cause the owner allows you to have a calm place to talk with a bit more privacy doesn't mean you can use that space, which is still his, to be racist etc. and if he finds out he might kick you out.
So the fact is, "swearing" (in that case) isn't allowed at all. Same as using certain drugs isn't allowed at all but the police can't put you into jail if they don't catch you but that doesn't mean it's alright.
That is basically the same as saying you can do stuff without a persons consent just cause the homeowner said you can use the room to talk. Bad for all the people is just that the room has a camera in it which ingame is called chatlog, lol.