When I was still in high school the generic use of "Coke" was fairly common. Seems to have faded out in the last 35+ years. "Pop" seems to be most common in my circle but I hear "soda" almost as often.
When I was a kid the old timers called it Soda Pop, I've heard that from older relatives across the country.
I think the aisles at.the grocery stores are tagged with SODA.
Since I moved around quite a bit both as a kid and while in the Navy I just learned to adapt to what the locals do.