Gun shows I can understand. I dont go anymore, and dont miss them. They looked too much like flea markets, didn't offer any better pricing, and I've seen enough bad gun handling at one show to last a lifetime.
Stores and ranges, I kinda understand. If not for the signs, "show and tell" can get nerve racking... The LGS I frequent has (had?) a "no loaded firearms" sign on the door, that accomplishes one thing: folks dont handle hot carry guns in the store. They either leave it in their car, unload it, or CC normally.
He knows I'm in the last group, but has only kinda brought it up once. He asked if another customer could see my holster and I said "yeah, let me borrow some ears so I can go in the range and clear my pistol." I never heard anything else about it, but I've never handled a hot pistol in the store either...
You would probably be amazed at the number of folks who think its okay to show off their carry gun because they're in a gun store.