I agree with BradP.

If I had a dime for every threat of a lawsuit, I'd be a millionaire by now...Stop and realize the reality of the situation before pursuing consulting a lawyer on every little matter. If he sues, then so be it. Don't let it be a threat. Just keep the letters and proof of what they say isn't true. When and IF they really do bring a suit, then make the effort to defend or counter-suit. Save yourself the money and worry until the paperwork is filed and delivered. It's when the tire meets the road.
Most of the time it's a whole lot of hot air from their own steam engine. I just take the threat in stride and tell them where to deliver the paperwork. The membership will just need to know when that paperwork arrives and how much money your going to spend on legal action. Even major corporations divulge in their perspectus given to their shareholders any pending lawsuits. HOA members are shareholders.
Lawsuits can be threatened for everything and anything. They can be filed for it too. It doesn't mean it passes the mustard when it gets to the courtroom. Court can only make someone "Whole" and benefit/reward them. So if they are suing, it most likely can't be based strictly on punitive damages. They have to show proof they incurred and expense they otherwise wouldn't have if they didn't obey the HOA's rules. The HOA can counter-sue for anything including they wouldn't have had to hire legal council. It just has to be a shown expense in dealing with the issue.
Hope this helps!