It's very unfortunate that all I received was downvotes, without a single substantial reply as to what would be particularly incorrect about the observations I made. This does indeed seem to stem from infallibility tribalism: "I identify with group A, so literally anything that can be taken as pointing out a flaw of group A is an attack on me as a person".
At the same time, this isn't a particular hallmark of the left; it's even worse on the right. In any right-dominated space, my comment, if the roles were swapped, would simply have been instantly removed rather than just being downvoted. r/conservative is a very prime example. Twitter is another one, having become much more eager to instantly abide by requests from foreign autocratic regimes to remove/ban accounts that oppose them after the Musk takeover.
I do wonder if you're going to downvote me for this comment, reaching a new "irony level" world record :)