I don’t know if it’s been confirmed by Musk, but it’s been stated by his (also shithead) dad in an interview:

He also recalled a time when Elon made a hurtful comment to a schoolmate about his father’s suicide.

The boy pushed Elon down a staircase at school, injuring him so badly he had to be hospitalised.

When he heard what had happened, Errol wanted to defend his son.

“But I realised Elon overstepped the mark with this little boy. I had to drop it,” he said.

The way he is would be sad if it wasn’t completely self inflicted, and also hurting a lot of other people.