While I do somewhat agree to this rule, I also disagree with it.
I understand that during my time on the battle server, it has gotten quite inappropriate, but it's happened..surprisingly rarely. I'm sure that most of our regular members are quite used to what happens on this server, and won't really find offence to the stuff that happens there (even some young users join in) , but we also have young/new users who aren't used to the server would just get lost in the sea of inappropro. Personally, I'm neutral to this rule, but the only fact I dislike about it is that nobody's discussed it until it was implemented last minute. It's as if it just..appeared out of nowhere, and we didn't really get warning.
Almost everyone's against it, as Forever just posted, so I'm not so sure if it should be used at all...but, not up to me.