Actually, this applies much more broadly than to just the TG communities. Stripping words of their meaning because they have painful connotations for some individuals is actually a pretty common thing - you can't call someone "black", you must say "african-american". You can't call someone "male", you must say "girl with some excess tissue around the urethral area."

It doesn't make sense, but people aren't always rational about pain. :/

-B