He’s growing more and more irritable. He starts nasty Twitter feuds. He lashes out at media when they don’t lavish him with praise. In the eyes of his most staunch supporters, he can do no wrong. For the haters, he’s beyond redemption.

Sound familiar?

Yes, it’s stressful times for Elon Musk, and the Tesla Inc. TSLA, +1.95% boss appears increasingly frazzled with each passing day.

The latest evidence comes courtesy of “Montana Skeptic,” a self-proclaimed investment strategist and Tesla short-seller who writes bearish hot takes on Seeking Alpha and fires jabs in Musk’s direction on Twitter TWTR, -4.83% .

Actually, make that past tense.

Montana no longer writes for Seeking Alpha, and he has deleted his Twitter account. Why? He says Musk called the principal of the family office where he’s employed and threatened to sue should the critiques continue.

“My colleague then spoke with me about the phone call,” Montana explained in his farewell post. “We both agreed that Mr. Musk’s phone call and threatened lawsuit were actions that would tend to involve our employer in matters in which he has had no part. To avoid such a consequence, I offered to immediately cease writing at Seeking Alpha and to deactivate my Twitter account.”

The troubling part, according to Montana, is how Musk learned his identity.

“It appears to me his information came thanks to the doxing efforts of some of his followers on Twitter,” he wrote. Those efforts revealed Montana to be an investment manager who is allegedly heavily invested in the oil industry. To be fair, however, Montana has been open about his short position in Tesla’s stock.

Read one of Montana’s missives: Even with Model 3 success, Tesla is structurally bankrupt.

Still, Montana has other critics, among them being Electrek.com’s editor in chief, Fred Lambert, who sniffed unsubstantiated claims demand for Tesla was falling.

“I don’t even know how Seeking Alpha let this guy post his blogs anonymously,” Lambert wrote. He described Montana as “an internet troll attacking and insulting people online, which is one of the most cowardly things you can do anonymously.”

Montana, for his part, says he doesn’t believe Musk has any legal claim and that his response was simply to protect his employer and keep his job.

“And so, you might say, Elon Musk has won this round,” he said. “He has silenced a critic. But he has many, many critics, and he cannot silence them all, and the truth will out. With sadness, I say farewell. I thank you for the splendid ride.”

When asked for comment, a Tesla spokesperson pointed out that Montana’s boss “is a longtime Tesla supporter and was one of the first to purchase a Model S,” and that when executives became aware of Montana’s actions, “[he] volunteered to stop and did.”

Seeking Alpha also weighed in, saying, “[W]e are more committed than ever to providing the soapbox for bulls and bears on this, and every, stock.”

Editor George Moriarty also had a message for the departing contributor: “Thank you Montana Skeptic for 138 articles and more than 10,000 comments on Seeking Alpha,” he wrote. “You have been a great friend of investors with your insights and the generosity of your time.”