It seems to be allowed though, as long as it is only the popular internet forum trolls here slandering everyone else. Guess nobody ever said that there weren't "forum favorites" around here though that are allowed to consistently break the rules without having their posts deleted. Just like I'm sure THIS off-topic post will suddenly fall on the other side of the rules.
C'est la vie. You can only control your actions, try and stay out of the mud. If others choose to act childish there is nothing you can do but realize that hopefully others see their behavior for what it is.