Bill Murray (not a billionaire) once said something along the lines of "When you become famous, you turn into kind of an asshole; you have about six months to turn that around or it becomes permanent."
I'd expect it applies to billionaires as well. I've interacted with one (Gates) who seemed like a pretty decent guy - particularly now that he's using his $$$ to make the world a better place for people not nearly as rich as even a poor American. And from what I've read Buffet also seems like a decent guy.
But Elon clearly seems to have 'stuck' in asshole mode.