According to a biography of Donald Trump, the former president who is aiming to become president again, was a little bully who loved to pull girls hair and once threw rocks at a toddler in his playpen. Trump was a loud-mouthed classroom know-it-all who could never admit he was wrong and boasted of giving his music teacher a black eye. He was also a show-off who yearned to hear the crowd’s applause . . . but who would smash his baseball bat in fu…