He forgot to tell em about the chain smoking and binge drinking alone in the room with your pistol on the desk to suppress.
This is a joke but its actually a fairly decent explanation of why you can't switch genders. You don't understand the 1000 little unspoken rules and behaviors you'd have picked up being an actual man or woman (Also you can't change da chromosomes and your plastic surgery looks bad)
https://media.nicecrew.digital/5d26968f4f8b09f85aa212e47d75c3adbf1b079575c07d2ace9e82f9c8dbbd19.mp4