[mathieuh]

How many times has he tanked his own company’s stock with ill-advised comments? Do you think this Twitter saga demonstrates competence?

In my experience, outside tech bro circles he is unanimously regarded as an idiot and not someone to emulate.

[ralusek]

I'm not sure you want to use "value of his companies due to things he says" as your marker for incompetence. Many of his companies are seriously overvalued precisely because the things he says drive up the value far beyond where it should be.