Earlier quoted context omitted.
There's two ways of reading this. You can read it from a technical perspective and take the message of something along the lines of "Don't invest your ego into unnecessary technical questions because it'll stop you having logical and productive discussions". But if this were written today in the context of something like this SE issue you could read it as tone deaf - a trans-man/women doesn't choose to face discrimin…
I see what you mean. I guess perhaps another way of characterizing PG's advice would be to keep your identity as small as possible, but no smaller. 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…
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.