You have to recognize the psychology beneath anti-Elon sentiment to understand where this is coming from. It is to a large extent political hatred from the far-left, and Anonymous is largely a left-activist group right now. Polls run in /r/EnoughMuskSpam confirm the demographic reality of the most staunch Elon haters.

Elon is symbolic of capitalism working. He creates cognitive dissonance as someone who applied capitalism (with subsidies that level the playing field versus oil externalities) effectively to environmental sustainability. He creates cognitive dissonance as a capitalist who created innovation (VTOL) that a public government funded agency (NASA) couldn't do by itself.

Elon is white, male, and wasn't overtly anti-Trump. Elon's ancestry is white South African.

Elon is rich.

Elon dislikes regulators.

Elon isn't afraid to criticize left-wing politicians in public.

These are the real reasons behind the strongest forms of Elon hate on the left that we see. The actual things he's done worthy of criticism (e.g arguably false advertising on Autopilot) factor in but I don't believe it is the real reason underneath it.