I have dealt with the "Wilford Brimley" look-alike as well. A really unpleasant individual, to be polite. Tried to buy a Mauser pistol from him once, it was 3 days before payday so I offered to come to his house / shop whatever and get it in 3 days. He refused to do so, said he didn't want anyone to know where he was from. He had that pistol on his table for the next 2 years, I made a point of talking to him and saying "still got the pistol, huh?"
Back when Doug B. had Great Southern Arms I worked the gun shows with him in Jackson and Hattiesburg. LOTS of the dealers came to out tables to ask Doug his opinion on the C&R rifles they were offered in trade / for sale. The dealers were always cordial to Doug, and to me (I guess since I was working with Doug) but I was appalled at how they treated some of the attendees who were trying to buy or sell stuff- some were real jerks.
We had individuals come to the table with bubbaized Swedes, Mosin Nagants, etc., who weren't too happy when Doug told them their rifle had no collector value due to the modifications. One I remember in particular had apparently been shooting corrosive ammo in his MN rifle for 20 years or so without cleaning, barrel had stuff growing in it. Tried to explain that the corroded barrel could lead to a bullet shedding the jacket, and the next round would explode the barrel. He thought we were trying to cheat him. But we weren't buying anyway, we were selling rifles, just offering genuine advice. This is the same guy who tried to tell us it was a "sniper" rifle 'cause the rear sight flipped up...