Let's say for a moment that you "live under a rock" enough that you actually haven't got a clue why Musk is such a hated figure (not only just here, but across a huge portion of humanity)...
You should count yourself lucky that you haven't been absolutely assaulted by the monstrosity known as "modern media". You're one of the fortunate few. Enjoy your life. It's better than many.
But lying (e.g. “full self driving next year”) and cheating (too early inclusion of spacex into various indexes) and whatever dogde was, should explain most of it.
Connections with other disliked characters doesn’t help either.
He’s lost his mind IMO, from drugs and extreme social media addiction. As for the right-authoritarian “fash” stuff I’m not sure if it’s always been there or if it’s an opportunistic infection.
I still give him credit for helping push the EV revolution forward and for finally building reusable rocket boosters. The latter has been talked about and studied for decades before and is clearly the best way to make a reusable launch system but NASA and its “old space” contractors never executed on it. Probably because overly complicated approaches like the shuttle and disposable rockets were more short term profitable.
But note that all that stuff happened for the most part before the mid-teens, or at least that was when Musk made his contribution to it. I don’t think his mind is what it was.
If he’d died in 2015 he would be the GOAT. Die a hero or live long enough to become a villain.