Well, if I got sholio's point right, she meant exactly that: people want pairings to be from different camps, so to speak, not the attitude like "geeks have to be with geeks, jocks have to be with jocks, and don't put colours in with the whites". So, an asshole/saint pairing works for people (although I don't think Mulder was quite that of an asshole *gg*).
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