Earlier quoted context omitted.
In my experience on social media, this sort of thinking is typically classified as "both sidesing" (or an assertion of "false equivalence", etc etc etc), and is considered to be highly inappropriate. And the people that say these things are often otherwise clearly intelligent, it is less common on HN perhaps, but certainly not uncommon.
Yeah, well, knee jerk both sides are the same which completely ignores major differences between those sides is really wrong. It is mental shortcut that leafs to wrong conclusions and often ends up being a lie.
I like to suggest that you should imagine the most absurd caricature of a member of the out-group that you can think of - whether that's a "leftist" or a "MAGA republican" - and then ask yourself how many people you actually know who fit that description. Are you creating a scarecrow that's an amalgam of all the viewpoints you oppose?