WILMINGTON, Del. — Tesla founder Elon Musk took to a witness stand Monday to defend his company’s 2016 acquisition of a troubled company called SolarCity against a lawsuit that claims he’s to blame for a deal that was rife with conflicts of interest and never delivered the profits he’d promised.

And to the surprise of no one, the famously colorful billionaire did so in the most personally combative terms.

“I think you are a bad human being,” Musk told Randall Baron, a lawyer for shareholders who was pressing Musk to acknowledge his mistakes in helping engineer the acquisition of SolarCity, a manufacturer of solar panels.

“I have great respect for the court,” Musk later added, “but not for you, sir.”

The long-running shareholder lawsuit asserts that Musk, who was SolarCity’s largest stakeholder and its chairman, and other Tesla directors breached their fiduciary duties in bowing to Musk’s wishes and agreeing to buy the company. In what the plaintiffs call a clear conflict of interest, SolarCity had been founded by Musk and two of his cousins, Lyndon and Peter Rive.

In the Delaware Court of Chancery on Monday, Baron sought to establish that Musk has sought to run Tesla without interference and therefore bears responsibility for any failures. The lawyer showed a video clip in which Musk said he liked running his own companies because he doesn’t want anyone to make him do what he doesn’t want to do.

As an example of what he characterized as Musk’s imperious management style, Baron mentioned that the CEO once declared himself “Technoking of Tesla” and gave his chief financial officer the title “master of coin” — a reference to HBO’s “Game of Thrones” — in a filing with the Securities and Exchange Commission.

The hostility between the billionaire CEO and the plaintiffs’ lawyer dates to at least 2019 and a deposition in which Musk insulted Baron and questioned his professionalism. On Monday, Baron played clips from that deposition to try to portray Musk’s stance toward what he might regard as criticism.

Pushing back, Musk insisted that “I don’t want to be the boss of anything.”

“I prefer to spend my time on design and engineering,” he said.

Musk, who is well-known for rejecting skepticism of himself or his company, insisted that he welcomes criticism:

“If I’m mistaken,” he said on the witness stand, “I view critical feedback as a gift.”

Musk said his off-beat titles and other quips simply reflect his sense of humor.

“I think I’m funny,” he offered.

What’s more, he said, the resulting media attention often plays to Tesla’s benefit.

“If we’re entertaining, people will write stories about us,” and the company can save on advertising.”

Regarding Tesla’s all-stock acquisition of SolarCity, Musk asserted that he had nothing to gain financially from it because he owned shares of both companies.

Musk also argued that SolarCity’s failure to meet aggressive sales forecasts and its loss of market share were only temporary setbacks. He said they reflected his decision to divert Tesla resources toward salvaging production of the Tesla Model 3 electric car — and then running “headlong into a pandemic.”

The effort to salvage Tesla 3 was “all-hands-on-deck” operation — so desperate that even the company’s lawyers were enlisted in the effort, Musk said, drawing laughter in the court.

Musk’s defense noted that SolarCity had been in Tesla’s plans as early as his 2006 master plan for the electric carmaker. In saying so, he asserted that the joining of the companies 10 years later wasn’t an emergency bailout as the plaintiffs have alleged.

But Baron pointed out that the 2006 document mentioned only a potential marketing arrangement, not a full-fledged merger or acquisition, between Tesla and SolarCity.

Baron repeatedly pressed Musk about evidence that SolarCity had been in trouble — short of cash, unable to obtain financing, in danger of violating the terms of an existing loan agreement — before the Tesla buyout.

Musk conceded nothing. He argued that SolarCity could have raised money, if it wanted to, by issuing shares of stock. And he noted that fast-growing young companies, including Amazon and Tesla itself, often bleed cash in their early years before achieving success later.

Why, Baron asked, did another Musk company, Space X, waive its own investment guidelines to buy risky SolarCity bonds? Musk replied that those bonds offered a better payout than did bank accounts that paid little more than zero.

“I had faith,” Musk said, “in the future of SolarCity.”

Baron tried to pin down whether Musk had recused himself from Tesla-SolarCity negotiations to avoid a conflict of interest.

“I had no material role,” Musk said.

“What’s is a ‘material role?’ ” Baron fired back. “That sounds like a wiggle word to me.”

“You’re the expert in wiggle words,” Musk countered.

The trial that began Monday marks the culmination of seven shareholder lawsuits, consolidated into one, that alleged that Tesla directors breached their fiduciary duties in bowing to Musk’s wishes and agreeing to buy SolarCity. Last August, a judge approved a $60 million settlement that resolved claims made against all the directors on Tesla’s board except Musk without any admission of fault.

That left Musk, who refused to settle, as the sole remaining defendant. The trial that began Monday had been scheduled for March of last year but was postponed because of the viral pandemic.

Daniel Ives, an analyst at Wedbush Securities, has called the acquisition a “clear black eye” for Musk and Tesla, in large part because SolarCity has failed to turn a profit.

“It basically was putting good money after bad,” Ives said. “For all the successes and all of the unimaginable heights Musk has achieved, this is one of the lowlights.”

Even if the trial ends with Musk having to pay personally for the whole SolarCity deal, $2.5 billion won’t much hurt the world’s third-wealthiest person. Forbes magazine has estimated that Musk is worth roughly $163 billion.

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Krisher contributed from Detroit.