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I don't care for calling it a "coke" as often times that is what I get.. and not to start a debate, but it is not my drink of choice, when wanting a soda.
Anyhow, I believe I ended up calling it a "soda" because of the proximity of where I grew up to here. (which surprisingly your link has both types of folks in that region, as there aren't that many people there, and most of the ones I knew FWIR called it "soda" as well).
The adult folk used to drive out to Hooper Springs and mix Kool-Aid™ with the water and call force it on the children as "soda" (or "glorified Kool-Aid™").
(please excuse my reminiscing)
In reply to Re: Re: Etymologies and Dialects