It is ok, if a man steal money it's ok as long as he didn't break and enter. Stealing is stealing. No matter how you split the hairs it is stealing. Like I said earlier it is ok for agents to state options and reference facts and try to hurt a business but the opposite isn't ok and according to some it only hurts the business credibility because they call out the thief. Sorry you can't have it both ways, well maybe you can.
Did he "steal" from you through the forum? I think what you are being told is that the situation did not have anything to do with the forum, but you came out and addressed it on the forum...and that, in a threatening manner.
No one is trying to justify that he didn't do you wrong, just that it should not have been addressed on the forum.