As a trans person, I’ve read your question, so I can answer truthfully, “yes, at least one trans person knows you reject ‘cisgender’.” But that leads me to ask you “am I supposed to care?”
How do you stop him? There’s a variety of ways - handcuff him, cut his arms off, cut his legs off, remove every sharp object from the house, etc. But all of these things ignore the real question: Why do you want to stop him?
Transgender people need to be able to update their birth certificates with their chosen names and experienced gender because other people are so frequently jerks to transgender people solely on the basis of them being transgender.
I really don’t know what it’s like to be a different height, as I’ve been this height for decades, so it’s hard for me to compare. But here’s a few things I’ve noticed.