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(There are plenty of people bandwagonning on Musk hate, and definitely some for his political bent, but there are also plenty of totally valid and non-political reasons to have disdain for him)
I'm going to agree with Walter that it's just human nature to want to drag down the successful. Envy is one of the seven deadly sins, after all.
People literally just trawl the most-successful-people list and find folks to hate. Simple as.
Of course you can also get it for philanthropic acts, but Musk doesn't, again because he's an asshole.