Here would be my advice, no matter the situation:
If you're having an issue with a customer or employee, deal directly with them, don't bring it to the board.
If the person with whom you have an issue decides to go public and you feel it deserves a response, type it up and save it to "Drafts". Then wait 24 hours.
At the conclusion of the 24-hour "stand down", check the thread. Has it moved off the first page? Good. No one cares about any thread on page 2. Move on to your next managerial crisis (there are bound to be several given the career you've chosen).
If the thread still appears to be an active grass fire, reread your draft (you found some things you want to change, didn't you?). Edit then post as a reply to the original complaint. THIS SHOULD BE YOUR ONLY RESPONSE TO THE OFFENDING POST. Stick to facts. Be professional, and most important...DON'T TRY TO BULLSHIT A GROUP OF BORN BULLSHITTERS. Be assured that if you do you will have your ass handed to you before the day is done.
Don't let anyone speak for you. If you have something to say, say it yourself. If it's not in the public domain, don't worry about it. Maybe a dozen people see those other threads...unless you say or do something to cause those threads to come back to life. Then it's all anyone wants to talk about for the next week.
There IS such a thing as bad publicity, particularly if you own a studio or agency. The more threads (other than reviews) that get created about you, the more amped up the drama factor. Continuous attempts at damage control will only exacerbate the situation. People start thinking "where there's smoke, there's fire". Your critics will make sure to chime in on every one, but those that may have at least some favorable opinion (but no real vested interest) will finally tire of it and will stop trying to defend you. This means the floor will be left to the critics.
You're welcome in advance for this invaluable advice. I expect repayment in the form of deep discounts when I come visit.