It is; the first LJ comment-swarm, hundreds of them piling on top of each other, that I ever saw was over the pop/soda debate.

If anything it's much worse than the Mason-Dixon line because at least there was one clear-cut line there; pop/soda has all kinds of twists to it: local rivalries, families rent asunder, some people who insist on being outside the box because they call everything "Coke"... It's so messy.