Even if you have never eaten in a Jack in the Box, make it a point to enter, complement them on their menu, then tell them you would like to eat there, but are uncomfortable with their anti-gun policy, so you are instead going to eat at a different “restaurant”, “one that appreciates the civil rights of its customers.”
You can bet your bottom dollar that their managers will report these “peculiar incidents” up the chain, and it will rattle some chains.
Be sure to use the phrase “civil rights”, because it will evoke memories of denying service based on race, which should make them twitch more than not.
If just a dozen of their stores around the country get such reports, it will get their attention.
Thanks, I can use that at Starbucks, whose products I actually do like.