Say Uncle has a great idea
It occurs to me that the guns in restaurants bill in Tennessee has created a marketing issue for local restaurateurs. On one hand, they can ostracize gun owners and cater to folks who, for some reason, fear inanimate objects. Cater to us gun nuts. Or remain silent, a de facto cater to gun nuts. There is another option. The could put up a sign (that doesn’t comply with the law) that says something to the effect of No Illegal Guns or No Unlawful Carrying of Firearms or some such. Then, the folks who wet themselves at the thought of guns will probably feel at ease. And those of us with handgun carry permits will be like I see what you did there.
I'd say go read the whole thing, but that's the whole thing. Sorry Uncle.
The funny part is a sign that says "Absolutely NO criminal activity allowed" is just as effective, but if you word it correctly, those who fill their Depends at the thought of a scary gun will buy into it. That's because people who are afraid of inanimate objects aren't that bright to begin with and you can sooth them with bullshit.
People who believe signs are magical will believe in those signs' abilities to create a force field around an establishment. You can cater to the irrational while informing the rational that they are welcome.
Personally, I'd have a sign that says "Warning. Irrational people eat here who may be afraid of your firearm. Please tread carefully lest you scare the sheep".
Remember, sheep have two speeds – Grazing and stampede.