By Ashlie Blakey A Manchester City fan daubed a vile slur about the Munich Air Disaster on his neighbours’ fence after discovering they were United supporters, a court has heard. Michael Hatton, 63, got into a bitter argument with his neighbours – a man and his girlfriend – in the Hollins area of Oldham over a wooden fence he had erected between their front gardens, the court was told. As the dispute heated up, Hatton painted ’58’ – a cruel reference to the 1958 Munich air crash which claimed the lives of 23 people, including eight members of the United squad – onto the fence. It was also said…