It varies. At one place I used to go to, you could mute them. But they disabled the mute button, so I stopped going there.
At a different place, I accidentally went into an admin menu (by pressing several buttons at once) and that made me nervous, so I stopped screwing with the buttons. While it's very tempting to try and hack them, everything is on CCTV now. It's probably a crime here in the United States of Corporatism.
Fortunately there are still gas stations close to my job where I can fuel the vehicle in relative peace. I'd rather give those places my business.