Teenage climate activist Greta Thunberg has hit back and sarcastically changed her Twitter bio after US President Donald Trump told her to “chill out” and work on her “anger management problem.”

Trump offered the unsolicited advice to Thunberg on Twitter after she was named TIME magazine’s Person of the Year — a decision which he slammed as “ridiculous.” In the tweet, Trump said the teen activist “must work on her Anger Management problem” and “then go to a good old fashioned movie with a friend!”

“Chill Greta, Chill!” he added.

The Swedish teen acknowledged Trump’s tweet indirectly by changing her own Twitter bio to describe herself as: “A teenager working on her anger management problem. Currently chilling and watching a good old fashioned movie with a friend.”

Also on rt.com ‘Chill Greta, Chill!’ Trump blasts Thunberg on Twitter after she’s named TIME Person of the Year

It’s not the first time Thunberg changed her bio in response to mocking comments from Trump. In September, when he sarcastically called her “a very happy young girl looking forward to a bright and wonderful future” she added the same sentence to her bio.

She did the same in October when Russian President Vladimir Putin described her as a “a kind but poorly informed teenager.”

Trump's 2020 campaign team have taken issue with the TIME Person of the Year accolade going to Thunberg and not him, even posting a TIME cover with Trump's face photoshopped over hers with a list of reasons why they believe he should have been chosen.

When it comes to keeping his promises, there's only one Person Of The Year: ✅Booming Economy✅Record Job Creation✅Historic Tax Cuts✅#AmericaFirst Trade Deals✅ISIS Destroyed✅Building the Wall#TIMEPOY#PromisesMadePromisesKeptpic.twitter.com/bEt9yqInqY — Trump War Room (Text TRUMP to 88022) (@TrumpWarRoom) December 12, 2019

Thunberg admitted last week that while her school strike movement had gotten “bigger and bigger” it had not translated into any political action and that it might be useless to continue. “We have achieved a lot, but if you look at it from a certain point of view we have achieved nothing,” she said.

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