The simple fact that he did what he did tells me he either has no business carrying a firearm, or may be slipping mentally. Stating that the folks around him had no problem with it is simplistic in the extreme. Other than the OP, and his friend, we have no idea if the folks in line even knew what happened. Just because they had no reaction does not mean they were switched on enough to comprehend what the guy was fiddling with at the counter.
Does anyone here really consider what the older man did to be acceptable gun handling? Anyone?
"A Liberal is someone who doesn't care what you do, as long as it's mandatory". - Charles Krauthammer