Regarding the actual story, I'm somewhat surprised anyone realized this was a thing. Now I haven't eaten Taco Bell in decades, but I can't recall their "food" not giving me the royal shits.
I'm shocked Idaho is the only one of the 11 western states (plus AK and HI) that requires it... Colorado, New Mexico, and Arizona aren't much of a surprise. CA, OR, WA, and HI it's a forgone conclusion they wouldn't want valid identification. AK and Nevada are a little shocking, but Montana, Wyoming, and Utah??? Ok Utah isn't quite as shocking as Montana and Wyoming.
So use the (men's) bathroom. Nobody there cares. The only time I ever went into a men's room and anything at all "happened", it was from the guy that followed me in at a Belly Dance festival. He said he had to double check the sign on the door - we had a good laugh!