President of the United States Donald Trump, in a recent tweet, trolled 16-year-old environmental activist Greta Thunberg for being named Time magazine’s “Person of The Year.”

Thunberg responded swiftly, changing her Twitter profile to: “A teenager working on her anger management problem. Currently chilling and watching a good old fashioned movie with a friend.”

The two have previously also shaded each other by passing snarky remarks.

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In September, when Trump and Greta, both were in New York for United Nations General Assembly session, Trump had criticised her. Meanwhile, Thunberg had dismissed Trump’s comments, and said she wouldn’t consider meeting with him on the issue of climate change.

Thunberg has spoken about her diagnosis of Asperger’s, a neurological disorder that creates difficulty with social and communications skills. She calls it her “superpower.”‘

In naming her Person of the Year, Time magazine said “Thunberg began a global movement by skipping school: starting in August 2018, she spent her days camped out in front of the Swedish Parliament, holding a sign painted in black letters on a white background that read Skolstrejk för klimatet: “School Strike for Climate.”

“In the 16 months since, she has addressed heads of state at the UN, met with the Pope, sparred with the President of the United States and inspired 4 million people to join the global climate strike on September 20, 2019, in what was the largest climate demonstration in human history,” it added.