Luke Littler has sparked a backlash online after waiting to shake Damon Heta’s hand following his defeat on Sunday. Heta beat Littler 10-8 to make te semi-finals of the UK Open, with the Australian performing brilliantly during the match. After the contest was over, Littler appeared dejected. He made Heta wait to shake hands, though the 36-year-old didn’t seem too fazed as he basked in the glory of his triumph. And darts fans have raged at Littler following his defeat, with many unhappy at how the 17-year-old conducted himself. “Luke Littler is such a bad loser,” said one X user. A second said…