I think it's a pretty good idea to think about how to not be a "Java programmer" or a "kitesurfer" (to pick two things that I could be identified as), since the former sets my brain up to be implicitly against, say, Kotlin or Haskell, and the latter sets my brain up to be against windsurfing. And I like all of those things too!
But certainly, there are things that are core to someone's identity, and I guess that's where each of us needs to find our own boundaries.
Identity can be a tool and a crutch. My feeling (as someone who identifies as human and has been hanging out/coping with the world for 3-4 decades -- a feeling, informed by a lifetime of good and bad situations) is that identity politics hurts more the identity-assertion people; the opposite faction is merely annoyed.
This is pretty common amongst business leaders; comparing their statements against their serious work quickly shows that it's not all so warm-and-fuzzy.
Virtue signaling may be its own reward to the masses, but it serves a real function for the well-to-do in preventing or at least confusing a Marie Antoinette effect. If there's any "let them eat cake" to be found, they can point to an abundance of more recent "truth to power" statements that will create enough ambiguity to tamp down the fervor of the mob, if and/or when it comes to that.
Disclaimer: It was written in 2009, read in context it's very clear the first interpretation is the correct one, there's an entire concept of identity that didn't exist in the public discussion when this was written.