WASHINGTON — Melania Trump, who last year promoted anti-cyberbullying tips as part of her child-focused kindness campaign called “Be Best,” sidestepped any comment Friday on President Trump’s recent decision to mock Greta Thunberg, a 16-year-old climate activist, on Twitter.

“‘Be Best’ is the first lady’s initiative, and she will continue to use it to do all she can to help children,” Stephanie Grisham, the White House press secretary, said in a statement first reported by CNN. “It is no secret that the president and first lady often communicate differently — as most married couples do."

A day earlier, Mr. Trump targeted Ms. Thunberg after Time magazine named her its person of the year. “So ridiculous,” Mr. Trump said on Twitter. “Greta must work on her Anger Management problem, then go to a good old fashioned movie with a friend! Chill Greta, Chill!”