Simmering anger over an unfounded 2016 accusation about Barron Trump from former talk show host Rosie O’Donnell boils over in former first lady Melania Trump’s new memoir. Nothing but “sheer malice” could have motivated a tweet and video in which O’Donnell suggested Barron Trump could have autism, she wrote, according to the U.K.’s Daily Mail. “There is nothing shameful about autism (though O’Donnell’s tweet implied that there was), but Barron is not autistic,” Trump wrote, according to USA Today. “Bullying a ten-year-old boy is egregious, but doing so under the flimsy pretense of ‘bringing aw…