That's what makes it ironic. Because had the person(s) lobbing the insult followed their org chart to the very top, would find Elon Musk, a person who literally came from "Africa".

Imagine if some middle manager at the Toyota plant in Indiana was racist towards an Asian American shift worker, telling them to "go back to Japan!" It's that level of unimaginable stupidity. While I don't question the veracity of the claims, it's genuinely difficult for me to believe that that kind of cartoonish racism still exists, especially in California.