The brother of Alejandro Garnacho has pulled no punches towards one fan after they aimed a swipe at the Manchester United and Argentina star. Manchester United winger Alejandro Garnacho has been away from Old Trafford with Argentina for the September international break. Garnacho came off the bench for a brief cameo appearance against Chile and the Spain-born attacker picked up an assist in the 3-0 win at the River Plate Stadium. Despite his impact at the River Plate Stadium in Buenos Aires last Friday, Garnacho had to settle for a place on the bench again for the match against Colombia. The 2…