It's so resilient, too. Like, I can see not examining things that Zuckerberg says because they don't sound idiotic on first glance. And the US is very much "more money = better than" so why not give extra weight to anything some rich guy says.
But Musk and Trump say multiple obviously-stupid things every day, are visibly wrong all the time, and still get breathless treatment. "Wow, Elon Musk says he expects oil to go to $69/barrel by the end of the week! Does he know something others don't??"