I don't know about case law, but when you walk into a grocery store, it certainly becomes their business!
Where's the case law and precedent that says your business is only your own, even when on a public sidewalk or in a grocery store? If you're going to make such unreasonable demands, can we start with your own claims, since you made them first?
If you want to get your mind blown, bring up traffic light cameras in Texas where people use "I have the right to privacy" to literally mean they should be able to run a red light [and potentially T-bone someone].
Public roads should be a clear case where your business is everyone else's business since you're hurtling down the road in an increasingly heavier vehicle, but we're far from being able to acknowledge that.