I understand if it is the wish for it to not go further.
My only reason for suggesting to send it directly to the club is that I know the club itself consists of a very small band of hard working people. Often, like all clubs, people come out of the woodwork and appear to be representing or associated with an organisation when they really aren't representing or a significant part of that organisation at all. Internet forums are good for that sort of thing as people don't REALLY know who is who.
By the sounds of it this person is an outsider who really doesn't represent the club at all........the experience you have had is not indicative of the experiences I am aware of from the majority of those involved and i know those who are currently running the club would like to know if they are being misrepresented. I do however respect the wishes of the person not wishing to take the matter further. In my view (and I accept it is only my view) it's not appropriate to be airing it in public if the club committee themselves have not been given an opportunity to eliminate the problem, or made aware of it. For all we know, the offender may not even be a member of the NCHG or be in any position to represent them. I do understand you frustration and anger though.....