Chief executives, trying to bring employees back to the office, argue that working-from-home leads to less engaged and less productive workers. But Tesla CEO Elon Musk is going one step further, calling the practice "morally wrong" in an interview with CNBC on Tuesday evening.

More from Fortune: 5 side hustles where you may earn over $20,000 per year—all while working from home Looking to make extra cash? This CD has a 5.15% APY right now Buying a house? Here's how much to save This is how much money you need to earn annually to comfortably buy a $600,000 home

Musk argued that tech workers—who he characterized as the “laptop class”—were unfair in demanding privileges that other people, like service workers or factory employees, could not enjoy. “You’re going to work-from-home, and you’re going to make everyone else who made your car come work in the factory? You’re going to make people who make your food that gets delivered—they can’t work from home?” Musk asked. “Does that seem morally right?”

“People should get off their goddamn moral high horse with the work-from-home bullshit,” he said. "They're asking everyone else to not work from home while they do."

During the U.S.’s stay-at-home orders in the early days of the COVID pandemic, white-collar workers were able to stay at home while workers deemed essential—often lower income or from minority populations—had to venture outside to go to work. In-person work sometimes led to COVID outbreaks in sectors like the meatpacking industry where working-from-home was not possible.

Longtime critic

Musk has long been a critic of remote work. Last June, the Tesla CEO ordered staff back to the office full-time, even as other companies were gingerly trying—and often failing—to get employees back in the office just a few days a week. Musk cited fairness in an internal email, noting that asking corporate employees to come in for 40 hours a week was “less than [what] we ask of factory workers.” (Musk also joked on Twitter at the time that Apple employees who refused to come into the office were being lazy.)