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The simpler, calmer point to make is: just don't non-ironically use the term "rootless cosmopolitan" on HN.

Yep. As I replied there, I appreciate both the clarification and the opportunity I've had to learn about a phrase to avoid.

I explained more here (it was a reply to a flagged dead comment so this relink helps visibility) - https://news.ycombinator.com/item?id=38727745