Here is more on the Great Carbonated Beverage Debate. At last, an interactive map showing the distribution of the use of the terms pop, soda, coke and other.

http://www.ugcs.caltech.edu/~almccon/pop_soda/

According to linguistics professor Walt Wolfram of North Carolina State University, the pop-soda-Coke divide is regional, and uninfluenced by race, age or income.


And note the website’s conclusion:

People who say "Pop" are much, much cooler.

I have nothing to add…