Manchester United fans’ reaction to Casemiro’s performance against Manchester City spoke volumes after the Red Devils suffered a defeat in the Community Shield on Saturday. Erik ten Hag’s men reached Saturday’s Community Shield match after Manchester United defeated Manchester City 2-1 in the FA Cup final at Wembley in May. United appeared close to capturing the Community Shield after Alejandro Garnacho came off the bench and fired the Red Devils into the lead in the 82nd minute. However, Pep Guardiola’s men rallied back and Bernardo Silva produced an all-important equaliser in the 89th minute…