Hopefully not too off topic, but I believe the preferred nomenclature is more along the lines of "People who are transgender" (though I could be wrong and would appreciate someone saying so)
"Person-first language" is a thing in special education- I wouldn't be surprised if that were preferred here. The idea behind it is that the adjective isn't the defining attribute of the person.
You know, thinking about it I wish this were focused on more. I think if more people had this mindset and just remembered that we're all people first we might be kinder and less hateful to one another. Focusing on what we have in common before the small differences that are a part of our identities. There's so much hate of others in the world and it makes me sad.