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President Donald Trump was not impressed that Time magazine chose 16-year-old high school dropout Greta Thunberg as 2019 person of the year.

Thunberg is a Swedish activist who travels the world by train and boat to campaign against climate change.

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Photo: TIME magazine

In a Thursday morning tweet, Trump called Time magazine's choice "ridiculous" and suggested Greta work on her "Anger Management" and make new friends her age.

"Greta must work on her Anger Management problem, then go to a good old fashioned movie with a friend," he wrote.

He added: "Chill Greta, Chill!"

Photo by Stephanie Keith/Getty Images

Trump was referring to Greta's angry outbursts and her habit of speaking to adults in a disrespectful tone. According to her handlers, Greta is "autistic.”

In response to Trump's tweet, Greta, who has 3 million followers, changed her Twitter bio to read:

"A teenager working on her anger management problem. Currently chilling and watching a good old fashioned movie with a friend."

Trump is the 2nd world leader to publicly spank the teenager this week.

Brazil's President Jair Bolsonaro rebuked Greta after she criticized his country for not protecting indigenous Brazilians in the Amazon.

"It's impressive that the press is giving space to a brat like that," Bolsonaro said.