Manchester United were the FA Cup winners this afternoon as they defied the odds to beat rivals Man City at Wembley and Jamie O’Hara has used it as a chance to mock Arsenal. Goals from Alejandro Garnacho and then Marcus Rashford were enough for United to hold off City, who got one back late on through Jeremy Doku. For United, it means they’ve not only found a route into Europe but have also won a trophy, something not many teams manage to actually do in a season. READ MORE: What Lisandro Martinez did to Erik ten Hag right on full-time as Manchester United won the FA CupAs we know, that means t…