MSNBC writer Ryan Teague Beckwith said: “The effect was a kind of false humility. By dressing down, Musk seemed to be sending a message that he doesn’t need to conform to the dress code that’s long been expected of White House visitors, marking himself as separate from the Cabinet officials – and even the president – who were dressing the part.”

A new CNN/SSRS poll shows that 53 percent of Americans hold an unfavorable opinion of the world's richest man.