When I lived in the Coke region in the 90s to early 00's, it wasn't ever used this way on the menu, only verbally. I still catch myself doing it occasionally.
"Can I get a coke?"
"Sure, what kind?"
"A Pepsi."
To be more accurate, not many drank Pepsi, it was mostly Coke or Dr Pepper.
When I lived in the Coke region in the 90s to early 00's, it wasn't ever used this way on the menu, only verbally. I still catch myself doing it occasionally.
"Can I get a coke?"
"Sure, what kind?"
"A Pepsi."
To be more accurate, not many drank Pepsi, it was mostly Coke or Dr Pepper.