Luke Littler has hit back at Ricardo Pietreczko for calling him ‘arrogant’ by mocking the 29-year-old for letting him get under his skin in their feisty Belgian Open semi-final. The 17-year-old went all the way and won the Belgian Open on his European Tour debut in a tense final against Rob Cross. But the result was overshadowed by a bizarre incident in the semi-finals between Littler and Pietreczko. The teenage darts sensation trounced his opponent in a comfortable 7-3 win, but the German player was unhappy with something after the match. After shaking hands aggressively, Pietreczko leaned in…