I'm not trying to reject anyone's transition, I'm trying to figure out when, where and why it was decided that the past description in this case gets rewritten for the current context instead of continuing to to exist in an accurate form.
For example, we don't refer to a block of marble as a statue until it has become one. When referring to its past, we don't generally refer to it as a statue until it has become one. I was a boy before I was a man, when referring to that period of my life, expect anyone to refer to me as a boy (or child), and not my current state.
To be absolutely clear, I have no problem referring to someone as they desire in the present or future, but I've yet to see a good reason (beyond "it's disrespectful!", with little or no explanation) why a change in name or gender requires a rewriting of history. I would be happy to have an argument put forth I could get behind, it would hopefully make this less confusing in the future, and cause less friction if I misstep.