[JohnBooty]

  and it kind of seems like rewriting History if ex-colleagues talk about X-woman as X-woman in the past when she was not yet X-woman but Y-guy instead

Yeah, it is rewriting history in a way, and it can be tricky to navigate! I'm far from an authority.

I'm a 38 year-old male who has never had gender identity issues so here's what I do to empathize. I imagine that I was forced to dress like a woman and given a female name for the first 20 or 30 years of my life. That would have been a painful time. Additionally, I imagine that a lot of people think that I'm a freak for wanting to be treated as a man today.

When I put myself into those shoes... I can imagine how it would be incredibly reassuring/reaffirming just to hear people refer to me as "John" whenever possible, even when referring to times when I was forced to dress like a woman, since I was really "John" inside all that time anyway.