By Jack Gallagher FA Cup quarter-finals gave us plenty of entertainment on Saturday and Sunday, but it’s fair to say that the famous old cup competition saved the best of the action for the final game of the weekend. Manchester United saw off their bitter rivals Liverpool – and their hopes of winning the quadruple – at Old Trafford, with a 121st minute (yes, 121st minute) goal from Amad Diallo sealing a remarkable 4-3 win for Erik ten Hag’s side. Here’s how social media reacted to a FA Cup classic. 90min Man Utd WhatsApp channelLooking to keep up to date with everything happening at Old Traffo…