The “Be Best” hashtag from first lady Melania Trump Melania TrumpWatchdog confirms State Dept. canceled award for journalist who criticized Trump Ginsburg becomes the first woman to lie in state in the Capitol Rabbi memorializes Ginsburg: Her dissents were 'blueprints for the future' MORE’s anti-cyberbullying campaign began trending in the United States after President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE launched a Twitter attack on 16-year-old Swedish climate activist Greta Thunberg.

The president tweeted earlier Thursday that it was “ridiculous” that Time magazine chose Thunberg as its “Person of the Year,” an honor he was shortlisted for. Trump wrote that the teenager needed to “work on her Anger Management problem.”

Thousands of social media users called on Melania Trump to respond to her husband's remarks in light of her “Be Best” campaign, which encourages children to be kind on social media and speak “with respect and compassion.”

#BeBest and @FLOTUS you might want to have a discussion with your husband about treatment of children in public, I think that is a passion of yours. No? https://t.co/LhBFITN72e — Jennifer Gunter (@DrJenGunter) December 12, 2019

Several also noted that Melania Trump criticized legal expert Pamela Karlan last week after Karlan mentioned the Trumps' teenage son, Barron, during testimony as part of the House Democrats’ impeachment inquiry.

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"Pamela Karlan, you should be ashamed of your very angry and obviously biased public pandering, and using a child to do it,” Melania Trump wrote in a rare tweet.

Karlan later apologized for her comments, saying, "I want to apologize for what I said earlier about the president's son. It was wrong of me to do that. I wish the president would apologize, obviously, for the things that he's done that's wrong, but I do regret having said that."

Rep. Maxine Waters Maxine Moore WatersPowell, Mnuchin stress limits of current emergency lending programs Pelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book MORE (D-Calif.), a vocal critic of the president, wrote that she agrees with the first lady that “children are off limits.”

“Tell your husband to #bebest and go enroll himself in anger management instead of attacking such a brilliant and courageous teenager fighting for climate change,” Waters wrote. “@GretaThunberg we got your back!”

Melania, we agree. Children are off limits. Tell your husband to #bebest and go enroll himself in anger management instead of attacking such a brilliant and courageous teenager fighting for climate change. @GretaThunberg we got your back! — Maxine Waters (@RepMaxineWaters) December 12, 2019

“What say you, anti-bullying crusader, #BeBest warrior, minor child privacy protector @FLOTUS?” wrote Andy Lassner, the executive producer of “The Ellen DeGeneres Show.”

Actress Bette Midler wrote that the president was “bullying” Thunberg and it apparently went “unnoticed” by Melania Trump and her advisers.

Thank you for bringing the hypocrisy of #FLOTUS' #BeBest campaign to our attention. Her husband's bullying Ms. Thunberg, a child, seems to have gone unnoticed by her "team", and by extension, by Melania herself. https://t.co/0lvNM9tw9F — Bette Midler (@BetteMidler) December 12, 2019

The Hill has reached out to the White House for comment.

Thunberg did not address President Trump's recent comments, but changed her bio on Twitter to describe herself as a "teenager working on her anger management problem."

"Currently chilling and watching a good old fashioned movie with a friend," her bio reads.

Time announced on Wednesday that it was naming Thunberg its "Person of the Year" for drawing attention to the threat of climate change. She is the youngest person to ever to receive the honor.

The president’s eldest son, Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, criticized the outlet for selecting the activist “as a marketing gimmick” instead of pro-democracy activists in Hong Kong.

Updated at 12:58 p.m.