What is the point of your three words here? Legitimately I don't get it.
(De)legitimation is the dominant meta. Much more than arguing on the merits of ideas, folks argue on the legitimate status of their opponents real or perceived stance. A lot of it attempts to play to the audience rather than either side open to changing their minds. That's how I read it at least.
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The parent comment was about how the most partisan users post the most on social media and sure enough, the first response was by a partisan user.