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.
The problem is that "partisan" doesn't automatically mean "wrong".
People wield "the middle" as if it is some magic incantation that makes them correct or immune to criticism. In fact, it is generally the "middle" or, as I prefer to call them, the "inert" that tend to be wrong since they are always behind the curve rather than ahead of it.
In Milgram's experiment, only the most "partisan" refused to deliver the shocks. The "middle" dutifully continued right to the end and delivered the highest voltages even as their own distress mounted.
You may avoid politics, but politics may not avoid you.
They have the most to win/lose.
The rest are just going ‘WTF is this shit?!?’
Or, you know, they actually have a point, and framing them as just another partisan is an uncharitable response. Which, ironically, is typical of partisans.