Doesn't matter if there were no policy signs posted or how much we may disagree with the gunshop's decision to not sell him a gun. Most serious FFL holders would shy away from anyone acting "strange" and wanting to buy firearms, and the FFL can do so at his discretion with the blessing of BATF. As a long time FFL, if the customer acted as described "sometimes".. I think I would have refused, also. A reasonable mix of common sense and CYA paranoia would lead most folks down that path.