Lots of executives at big companies can be petty though, it's nothing new when one is in power and surrounds themselves with yes men. It doesn't mean they're necessarily having a breakdown at all.
What you've observed, quite accurately, is that our bar for emotional intelligence when it comes to corporate executives is the same that we expect from ten-year olds.
Engaging with reality as directly as possible is important in business. Emotions are a part of reality, usually a signal about social dynamics.
At the higher levels of serious companies — by which I mean ones trying to win in the market, regardless of size - managers and executives regularly receive training about this.
I can’t say more because this is my alt, but: “executives are childish”, “executives are psychopaths”, etc. are very common, often incorrect narratives. If anything executives should be straightforward and simple.
To return to topic: something is going seriously sideways with Matt, and I wish him the best.