I'm just going to point out that you technically could have discussions in game that would get you punished on the Boards. You could, for example, carry on about politics, or religion, or other subjects to your heart's content in game and not be punished for it.
I understand why certain things aren't allowed in one situation and allowed in another. I have no problems with that. For that reason I think the IFS would be a bad solution. You wouldn't be able to point out where people went wrong in their chat logs (like explaining that "kys" is bad), and it's unlikely to stop the gloating you're talking about (they could just as easily switch to another phrase, like "another one bites the dust").
I'm open to the idea of behavior on the Boards impacting your Honor, but I'm not sure how it should be implemented. If you can lose Honor on the Boards it would only make sense that you can gain Honor here too, but how would that work out? Who would say something is bad enough to warrant removing Honor, the mods? People complain about them enough as is, letting them impact end of season rewards would cause a riot. Making another IFS seems tricky because there is a lot more to discuss here.
Without a better option or some solutions, I'm going to lean towards "no" for this idea.