I don’t think Elon feels personally threatened. I think he feels hate and a misguided sense of heroism. If you listen to him speak enough, it becomes painfully obvious that he not only thinks he’s the most important person in the world, he also thinks he’s the smartest person in the world. Basically he thinks he can’t possibly be wrong, no matter how many experts who’ve dedicated their lives to the pursuit of knowledge in a field that’s new to him disagree with him.
That, plus the constant stream of right wing propaganda from his Twitter addiction, has convinced him that the acceptance of trans people will lead to the destruction of society. His brain is rotten to the core at this point. So he’s made it his personal mission to make trans people’s lives worse.