Sparky It has always been "Coke" to me.
Used to work with a guy like this. I'd never heard of such a thing. If not for him, your post would've been the first I'd heard of it.
I grew up with soda, pop and soda pop. Any of those work for me. Has never been Coke and never will be for me, but I guess that's like making a copy and calling it Xeroxing.