I think they're soo consumed with identity politics that they project their fears as your intentions. I took it as you meant it... that they're retconning the names and how weird that it is they would do something like that.
The idea of gender had nothing to do with it in my mind until I read their follow up posts and I had to double take. I read again to see if they were reading your same post I read. And yeah, I guess they could have bizarrely extrapolated that kind of meaning from your post.
No Cannoli, its not just you.
And interesting question you posed. Got a chuckle out of me. If they transition to another gender, why change their name from Sue to Bob? If Gender is inconsequential, why would having a man named Sue matter one way or the other?