I think in his mind he was trying to do a service and save someone from being scammed and I don't have an issue with that, BUT in doing so he has given the rep boards a black eye and drawn unnecessary attention to us and that is not cool.
Where do you draw the line? I say it's unfortunate but there shouldn't be any gray areas and if you post a rep on a gen sight, then you should be shown the door. Like others have said, many members visit both gen and rep message boards and if you say hey guys there is a damn good rep of the GMT out so be careful, they can sort it out amongst themselves. There is always that one A Hole who wants to be the hero and save the world from replicas.