"So ridiculous," tweeted the president. "Greta must work on her Anger Management [sic] problem then go to a good old fashioned movie with a friend!"
Unsurprisingly, Stephen Colbert had some thoughts on that.
"First of all, teens don't go to movies anymore. They stay at home and Tik-Tok their Vape pens on Fortnite. I don't know. Teenagers scare me," says Colbert in the Late Show clip above.
"But since Thunberg is Swedish, let me put this in culturally appropriate terms: Mr President, go Fjuk yourself. Which I can say on CBS, because Fjuk is an island in Sweden.
"It's lovely, they have a lighthouse. And you know where you can stick it."