Mr Musk, the South African-born innovator and billionaire behind Tesla and SpaceX, found himself in hot water after insulting Mr Vern Unsworth, a British diver who worked on the Thai football team rescue and who dismissed Mr Musk's plan to recover the trapped group.
Musk was both praised and ridiculed for his offer of help, but he reacted strongly to comments made by British diver Vernon Unsworth, who was part of the rescue team.
The rescue saga involving young Thai footballers trapped in a cave may be over, but a controversial "pedo" tweet by Elon Musk, in reference to one of the rescuers, has caused some trouble for him and his company.
The comment about the caverwas far from the first Twitter outburst for Musk, who is fond of talking about tweeting on Ambien.
Reuters reports that analysts and investors said Musk's public statements could be distracting him from what they view as his main task: making electric cars. "I'll take advice when I get back to London", Unsworth told 9News. Probably the answer in some cases is yes, I should say nothing.
In the weeks between Unsworth's initial discovery and the boys' rescue, chances seemed slim the boys would make it out alive.
In response to one tweet, the American businessman wrote: "Bet ya a signed dollar it's true".
In the tweets he only referred to Unsworth as the "British expat guy who lives in Thailand".
In the midst of the operation, Musk tweeted on Tuesday, apparently from Thailand: "Just returned from Cave 3".
"The submarine I believe was about 5 feet, 6 inches long, rigid, so it wouldn't have gone round corners or round any obstacles", Unsworth said.
"I don't know the guy, never met the guy, and don't want to meet the guy", he said.
Tesla shares were at $307.20 in after-hours trading on Monday from Friday's close of $318.87.
In the same month that he refused to pay an artist for an image he used of a farting unicorn, it has now been revealed that Musk was a major donor to a Republican political action committee. "Sorry pedo guy, you really did ask for it".
Representatives for Tesla did not immediately respond to a request for comment.
Jing Zhao, who recently filed a shareholder proposal to remove Musk as chairman of the Tesla board and install an independent director, said the CEO was being unprofessional and that it was "not his business" to travel to Thailand and try to directly solve the rescue challenges. "I'm certain they wish he would be a more cautious tweeter".