Manchester United fans have made their feelings perfectly clear on Kobbie Mainoo after the Red Devils star’s performance against Liverpool in the FA Cup quarter-final at Old Trafford. Erik ten Hag’s men punched their ticket to the FA Cup quarter-finals after Manchester United’s 1-0 win against Nottingham Forest at City Ground last month. The Red Devils welcomed Liverpool to Old Trafford on Sunday, with Jurgen Klopp’s men considered the favourites in the FA Cup tie against their Premier League rivals. Erik ten Hag has faced criticism over United’s underwhelming campaign and the Red Devils boss’…