Some of the sonics I have seen have a small indoor area to eat in if you wish. Or tables outside. Did NOT see any sonic provided storage area off site to leave your weapon though. And, it was a request. So let me get this straight. Could they “reserve the right to refuse service” to someone in that case? But you can’t “reserve the right to refuse service” to someone whose demands are counter to your beliefs. Like cake makers? Bizzarro freakin’ world. I think the old “We reserve the right to refuse...” won’t fly any longer with the perpetually offended.
It’s private property. It’s a little known secret that you can pretty much ignore stop signs in store and shopping mall parking lots, but there are exceptions depending on your city or state.
I treat them as suggestions.