Staggering sales drops, swastika-daubed EVs, companies culling fleet models, and fan-forum owners selling their cars—Elon Musk's alt-right antics are seriously impacting his electric car business.

Musk, who also runs SpaceX and a number of other companies, has been known to make big often exaggerated promises. For example, he once called the Hyperloop, which was never built, the "fifth mode of transport" and famously promised to take Tesla private in a Twitter post, saying he had secured financing that he didn't have.