The best thing to do is ignore it, and rate the thread 1 at the bottom of the page. The Rate Thread buttons do actually work. If a thread is rated less than 1.5 for more than a certain amount of time, it will automatically be moved to The Black Hole forum. Likewise, if a thread is rated higher than 4.5 for a certain amount of time, it automatically gets moved to The Hall Of Glory. You can help keep the forums free of people who post crap, and reward people who post well, by using the Rate Thread buttons.
If someone has posted something that directly violates the rules, use the Report Post button below the offending post to report it to the Mods.