Well this sticking to the rules no matter what is where you lose my sympathy. This is like TSA agressively checking toddlers and old grannies for making the scanner go beep or having some water, because, hey, if the scanner beeps they might be terrorists.
Just like screens are a new thing, this inflexible robot-like-behavior is also new, and geez, I wish you could also fight the second one.
Sure payment terminals are screens, but it's not like they're addictive screens where you get tweets or text messages...