I have only had one experience that I considered "negative." It was a Food Bear employee, who decided to ask me a number of questions. I got the distinct feeling he did not think I needed a gun, and wanted to make me "think about what I was doing."
As a result, I voted for the Business Employee option.
Overall, I'm willing to bet that businesses and LEOs are going to have the most votes. I say this simply because I feel that in both situations the person making the comments has an illusion of being in power over (Or being "more experienced" than, "smarter" than, etc.) the carrier of the firearm.