terminal baby syndrome 

To constantly behave like a baby or young child as an adult. This may include: being spiteful, crying about inane things, wanting attention, self-affirmation, or seen as a constant complainer.

I didn't realize you could get out of an offer to buy a public company for 24 billion, but damn, this dude has terminal baby syndrome.

terminal baby syndrome by Somebody, but not Nobody October 14, 2022