Trans people typically whose a new name, referring to their old name as their “deadname”. People who insist on using the deadname when they know the person has a new name are deliberately mocking, and even being cruel to, the person who has changed their name.

Musk continues to refer to his trans child by their birth name and gender. I can’t understand how someone would do that to their own child (much less anyone at all).

After purchasing twitter he chose for it a new name and wants everyone to use it, but by not bothering to I’m simply following his example.