New Pronouns- Combinations

That gender and sex are two distinct human characteristics is accepted by science and medicine, so calling it a mere belief displays ignorance. If people were merely delusional as would be someone who thinks they are a dog, they would be getting psychiatric help, not gender affirming care but apparently a lot of people have not read up on why doctors no longer treat this as a psychiatric disorder, as they once did being gay, also. When we learn, we update our worldview to accommodate what science has discovered.

As for it being fun to mock, I'll let those words stand for themselves as evidence if intention here.

I once mocked it out of ignorance too so I can have compassion for those who don't know any better yet, and try to educate instead of mock their ignorance on the subject.

But I would invite people to find out why things aren't what we used to think they were before launching dismissals or ridicule.