Manchester United chief Omar Berrada was booed by Manchester City fans when his face appeared on the big screen during Saturday’s Community Shield clash. The Moroccan used to work for Pep Guardiola’s side but left to join their fiercest rivals earlier this year. Berrada hasn’t had to wait too long to be reunited with his old club, with United and City locking horns in the Community Shield today. And it’s fair to say City fans don’t appreciate the 46-year-old’s departure, with fans from the club booing him as his face appeared on the big screen. Berrada is United’s CEO and has recently wiped hi…