What about stupid malice, or maliciously stupid? :-)

Does a bully thinks being a bully hurts their image?

As an extreme narcissist, he can’t fathom the idea that anything he does can hurt his image. Surrounded by devoted minions, everything he does boosts his ego. He’s mauling Twitter, and thinks this projects a powerful image of himself.

I never liked this guy, I think he’s an narcissistic spoiled brat, but even then I can’t believe he could possibly be so stupid to think that things like throwing away the Twitter brand for “X” make sense.