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So I experienced this from the point of view of the person being told recently in almost the exact situation you described:
“X goes by Y and uses she/her now”
“Cool! Ask her what snacks she wants”
arrive with snacks
“Hey Y! How’s it going?”
Kor: Curzon, my beloved old friend!
Dax: I’m Jadzia now!
Kor: Jadzia, my beloved old friend!
The teachings of Kahless show us that each warrior cuts their own path to Glory.