Well, it has two sides. Why should you get punished for badmouthing outside the community, but othersides why not?
I recall Gandalf saying something about this, but cannot remember if he said it should be punished or not, so not gonna spread an unconfirmed rumour.
But think of it yourself, why should the community want you, if you talk shit behind people their back or insult them by a personal method (Skype, FB or whatsoever). For me your relationship is only Argonath-based and nothing else than that, so why not punishing you within the same atmosphere?
Just don't talk shit and flame, then this topic was not needed.