Pop Vs. Soda

So Lisa and I were out at dinner the other night. The waiter comes around to take our drink order and SHE says, get this, "I think I'll just have a pop". "A what?" I say. "A pop." she says, looking at me like I'M some sort of crazy person. Honestly I couldn't believe that I was out at dinner with someone who calls soda, pop. I mean really, why not just put on a straw hat and some overalls, because you're making yourself sound like some kind of uneducated country bumpkin. Really, it's called SODA, or if you really want to get crazy, SODA POP. Never just pop by itself, what does that even mean anyways!?@?!