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ETA: Or more like - horizontal axis should say "Level of Disagreement". Maybe I just missed the whole point all together.
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I think it's just poking fun at the fact that people mostly hang out with people they mostly agree with, so they have a lot more exposure to things that they'll argue about. Just look at any part of arfcom - we all have a significant number of opinions and values in common, but since we all hang out on the same forum, we constantly have shrieking bitch-fights over little niggly things, like what company makes the best rail interface system, or when somebody says "clip" instead of "mag" and so on.
We don't have quite so many fights over, say, whether gun control is a good policy (that is, with people whom we have a fundamental difference of principles) because they don't come around here.
It's like saying you'll probably have 10,000 arguments with your wife, who you love, and only four or five with your worst enemy, because the former you're always around, and the latter you actively avoid and disdain.
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