It could have been as simple as "its okay to express yourself however you want or be whatever you want. You should feel safe to do so and we all have your back."
People transitioning to either gender expression has always been a thing. Changing a language seems unnecessary. However, I think respect is just the core message here. Respect all if they do no harm.
Especially because you shouldn’t give a fuck about how people perceive you. You should be whoever you are and not care about labels.
Unfortunately we are social creatures with a need for acceptance and belonging. We can survive without those things, but it isn't really living. Take it from someone who spent most of their life living like a hermit.
Having someone recognize your gender is one of the most basic kinds of acceptance. Social interactions tend to feel pretty hollow and superficial when you know that the other person doesn't know/care who you really are. (Again, ask me how I know 🙂)