You are absolutely right they can make what ever crazy rules they want. It's the reason they gave that's absolutely BS. If the guy at the door was just like "no airpods, store rule" then yeah its just a silly rule and that's the end of it. It's when people start over thinking it and trying to guess crazy reasons for the rule that it gets ridiculous.

I would also argue that most people don't leave their phones in the car and bring them with them when walking into a dispensery. Only because why would you leave your phone in the car, that's odd.