West Ham fans on social media have called for the club to sack David Moyes as they went 4-0 down to Arsenal on Sunday. The Hammers had gone into the game hoping to beat the Gunners for the third time this season. Yet Arsenal were unplayable as they scored four times without reply before half time. William Saliba headed the north London giants in front from a Declan Rice corner, with Bukayo Saka then doubling Arsenal’s lead from the penalty spot. And further goals from Gabriel and Leandro Trossard saw West Ham fans inside the ground head to the exits. It was a chastening start to the match for …