By Matthew Cooper Luke Littler was booed on night 15 of the Premier League Darts, with the Manchester United fan playing up to the crowd in Leeds. Littler was previously booed when the Premier League visited Liverpool last month given the rivalry between the two teams and the teenager cheekily referenced the Reds’ Merseyside derby defeat during one of his walk-ons that day. He ultimately went on to win the night, beating Rob Cross in the final, and he received a similar reception from fans in Leeds as they also have a longstanding rivalry with the Red Devils. Littler was once again booed durin…