Ruben Amorim made his anger and frustration clear after his maddening Manchester United team blew a lead in the Old Trafford draw against struggling West Ham.A promising five-game unbeaten run came to a shuddering halt in their last home outing 10 days ago when Everton eked out a 1-0 victory against the uninspiring hosts.United responded with a 2-1 comeback win at Crystal Palace on Sunday but failed to build on that result back at Old Trafford.