There was considerable anti-Chinese sentiment in Australia at this time. As a boy, Sing was well known for his shooting skill, but was the subject of racial prejudice due to his ancestry. He began work hauling timber as a youth, and later worked as a stockman and a sugarcane cutter. Sing became well known for his marksmanship, both as a kangaroo shooter and as a competitive target shooter. In the latter role, he was a member of the Proserpine Rifle Club (one of the many rifle clubs in Queensland that were partially sponsored by the Queensland and Australian defence forces to develop shooting skills). He regularly won prizes for his shooting, and also played cricket with skill.