Please change the title to transgender instead of tranny.

Eh, I can't tell if you're being sarcastic or not, but just in case... The only acceptable term to use is transgender, unless that persons says you can call them something else, in which case you only call them. You can't go, "Oh,well, one time someone told me I could call them a tranny, so it's cool if I call others that since I have permission." Nope. Not allowed. Only the person who gave you the permission is allowed to be called that by you.