Content rating does not extend to social interaction within the product’s service environment. The service provider conditions and regulates the terms under which the service is used.
The regulations have been stated within the legal documents you've had to agree with upon installing this game. If you need a cuss crutch within your sentences, or feel safer surrounded by those that do, feel free to remove the automatic chat censor which can be done by unticking it in the Chat subsection of the Options menu within the game.
However, bear in mind that the social interaction sanctions still a