Antoine, 17, wowed this British audience on “Britain’s Got Talent.” His story of dropping out of school after being bullied over his weight has touched millions. He probably faced comments like Simon Cowell’s line when he walked on stage: “Just when you thought things could not get any worse.” It was not worse. Instead, it made him the new Susan Boyle of unexpected stars after his performance with partner Charlotte Jaconelli of “The Prayer.”