If we had to remove all passive aggressive/snarky comments from the Boards, there wouldn't be a whole lot left.
[slayer-jinx-wink]
In all seriousness though, it isn't in violation of the Universal Rules. The rules in-game are different from here. While we try to align those that should be aligned, like verbal abuse and consistent harassment, simply being sarcastic on the Boards isn't as big an issue as it is in-game. You can downvote someone and move on here, you can't when you're stuck in a game with them.
As Deep Terror Nami stated, the best thing to do when someone on the Boards is saying things you don't like is ignore them and don't reply. Nine times out of ten they're looking for you to respond to them so they can continue to comment. If you don't reply, you give them nothing to reply to and they lose their power. This is basic forums/boards/internet 101 here. If they say something that breaks the Universal Rules, hit the Report button. Otherwise, downvote and move on.