Me: Oh! I'm glad that you're doing that! I'm glad you're being true to yourself. (Sorry, I never know what to say in situations like this, but I do support people no mater their gender, sexuality, etc.)
Jane: That's great! We totally support you!
EJ: Yeah!
Jeff: For once, Jane is right.
BEN: Uh-huh.
LJ: As long as it makes you happy.
(Sorry for not adding all of them, if I added anymore it would pretty much be saying the same things, so lets just say they are all happy with your decision and support you)