Hi Emma,
So sorry that you've been bullied by this person, it happens over here too, some of the full-time and fully transgendered, were quite "stand offish" with me when I made my first faltering steps as Trans, perhaps they needed to do this, to help convince themselves of their own "status" of being superior to me at that time. I remember thinking that it seemed to be hierarchical, something that I had not long left behind as a SCUBA Diver.
Bluntly, it's distasteful, destructive, and saps what small amount of self confidence that someone starting out on their journey might possess...........
Hugs,
Eve