Eddie Izzard actively uses the word transgender as an identifier for themselves. Transvestite is indeed part of their identity but it is very important not to erase their identity as transgender as well.
Eddie Izzard does not identify “fully” as female but that does not change anything.
Joffrey hate aside, I think we should all thank Jack Gleeson for the excellent performance he has given us while on Game of Thrones. It takes a lot to make a character that repulsive and vile when you’re the complete opposite in real life.