I live in the bible belt, where "coke" is supposedly used, but to be honest I've never heard anyone use it like that. if you say "coke" people are gonna think you mean coca cola, or as a stretch maybe like off-brand versions. but it could never mean sprite or grape soda or anything like that, or even pepsi
it's just soda mostly I think. definitely not "pop" tho, idk what kinda freak ass mother forgeters say that