Elon Musk isn't impressed with fellow billionaire entrepreneur Bill Gates.

After Gates said he bought himself an all-electric Porsche Taycan, Tesla's CEO took to Twitter to throw shade at the Microsoft co-founder.

"My conversations with Gates have been underwhelming tbh [to be honest]," Musk tweeted.

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Gates revealed his purchase in an interview with popular YouTuber Marques Brownlee. Brownlee, mentioning Tesla, asked the billionaire about efforts to address climate change with clean energy products like electric cars.

The 64-year-old responded by saying that electric vehicles would still fall behind gasoline cars when it comes to range, but added passenger cars are "one of the most hopeful" factors in bringing down the cost of environmentally friendly alternatives.

"And certainly Tesla, if you had to name one company that's helped drive that, it's them," Gates said. But he's not buying one of the company's cars just yet: "I just got a Porsche Taycan."