Not only did Elon not found Tesla[0], but many employees have described the "babysitters" or "handlers" who are responsible for making him feel like his ideas have been implemented, so that his caprice and bluster don't interfere with the actual operation of the company.
To give him his due, he's a phenomenal manipulator of public opinion and image, and he certainly has invested a lot of his emerald-generated wealth into numerous successful ventures - but he himself is not a positive contributor to their success.
[0] https://autoworldjournal.com/is-elon-musk-the-founder-of-tes...
I feel that a lot of people simply don't like Elon because of political reasons which are often also based on misinformed opinions. It also can't be denied that he is an intelligent person. You can hear it when he talks in interviews.
Now I think ultimately any ultra wealthy person is going to have some flaws that people can find and latch onto in order to hate someone.
While I certainly won't deny that I do strongly disagree with all of Elon's politics, I'm being as fair and unbiased as I can when I say - we must be listening to different interviews. The man sounds like a caricature of a bumbling college stoner philosophy student most of the time.