Almost all of the security we have in this country is about making sure people don't bring guns where they aren't supposed to. Personally I find the degree of security in many office buildings to be quite silly. Do they really need metal detectors? But they do, and what they're trying to detect is guns because obvious.
So all the gun nuts having their feefees hurt because the starbucks guy is asking very nicely for them to not bring their giant external penises into their stores is really just kinda funny. If this trend of proud external penis wearers booms, the result is just going to be... metal detectors in any place that can legally exclude guns. Yay freedom.