Here in Atlanta, no matter what soft drink you order, the generic term is “coke,” as in, “Wanna coke?”. When I lived up north, it was “soda,” or “pop” (or “soda pop” in some places). This map plots the preferred term regionally. It’s a fun little distraction on a Monday.
Personally, I’ve always said “soft drink,” proving once again, that I’m something of an outlier.
See the interactive map here: The Pop vs. Soda Page