Plenty of independent, valid reasons to dislike the guy. Some of them are purely political. Some have nothing to do with politics.
You might not agree or value these, but that isn't the same as them being
invalid:
1) he's an anti-trans right winger. If you aren't, you might dislike him.
2) he's boastful and prideful, which some people find irritating.
3) he lies, constantly about the capabilities and timeliness of his companies. If you are excited about EVs or space or tunnel boring you might dislike the hype->reality->hype cycle.
4) guy is... kinda just an asshole online?
5) if you believe billionaires are fundamentally people who got their money exploitatively, you'll dislike musk.
6) you might disagree with his stewardship of key technologies in space or evs. He's made prioritization decisions one might disagree with.
7) he made high speed rail in California more difficult through the hyperloop nonsense
8) he's anti worker and anti union, and many people here are workers or union members and find the way he treats his employees as unethical.
9) he's has a history of having many children out of wedlock, and kinda ignoring those children and women
10) he has positions about birth rates that could be just esoteric or could be great replacement theory racism and it's unclear which is true.
Probably many reasons beyond these. If someone believes one of these, they might leave a pretty tepid comment.
If someone believes multiple of these, odds are good they'll see Musk as a villain.