By Felix Keith Luke Littler has reacted with bemusement after being accused of arrogance by a defeated opponent at the Belgian Darts Open. Littler overcame Rob Cross in superb fashion to win the title on his first appearance on the European Tour. The 17-year-old was in electric form in Wieze, hitting a nine-darter in the final against Cross on his way to a 8-7 victory. But his triumph was not without incident, with Ricardo Pietreczko unhappy with the manner of his defeat in the semi-final. The 29-year-old German, known by his nickname Pikachu, turned heads with his reaction after losing 7-3. P…