It's because there is a vast concerted effort by the political left to destroy Musk now that he is no longer regarded as being strictly on their side. It's at Trumpian scale these days, in terms of the venom being directed at him.

Reddit is overflowing with non-stop Musk hatred. They spout lie after lie about him in every single thread where he's a topic. The most popular lie being that his business efforts - ie his success - were funded by an emerald mine that his father owned (neither thing is true).

The goal is to strip Musk, top to bottom, of any and all personal accomplishments. And to repeat any lies necessary, as many times as necessary, to reach that end.

I say this as an emotionally independent, objective observer of the craziness, I have no stake in it, and don't feel one way or another about it. The seeming mental illness the topic of Musk draws out of people is astounding however, the herd promptly acts like deranged lunatics when he comes up as a topic. Partisan collectivism mentality in action perhaps.

Until Trump drove them nuts I had never seen anything like it before, in person or online. There must be a name for such a massive scale of crowd insanity, to describe the frothing-at-the-mouth irrationality that a single entity can spur in a very large number of people.