Trump attacks 16-yr-old girl.

Jealousy is a terrible thing. President Trump, 73, has hit out at 16-year-old climate activist Greta Thunberg in a fit of rage after she was named Time magazine’s Person of the Year.

Trump described the decision, which was announced Wednesday, as “ridiculous” in an incredibly petty Thursday morning tweet. The president wrote: “Greta must work on her Anger Management problem, then go to a good old fashioned movie with a friend! Chill Greta, Chill!”

Trump has long been obsessed with Time’s Person of the Year—in 2012, he tweeted: “I knew last year that TIME Magazine lost all credibility when they didn’t include me in their Top 100.” In 2015, when he was a candidate for president, Trump reacted angrily when German Chancellor Angela Merkel won the honor.

Several fake Time covers showing Trump as Person of the Year have been found hanging in at least five of his golf clubs.