A FATHER who punched the supervisor at his son's kindergarten because he was unhappy with the teaching methods, yesterday lost his appeal. Taxi driver Cheung Ming-chi, 39, was convicted of assault at Kwun Tong Court in July. He was appealing against sentence before Mr Justice Bewley in the High Court. His counsel, Hanif Mughal, said that the one-month jail term, suspended for three years, imposed on his client was excessive and wrong in principle as he was a first offender. Mr Justice Bewley said it was an unprovoked assault. The court heard that Cheung's five-year-old son was attending a Kwun Tong kindergarten. There had been animosity between the school and Cheung for some time. On April 19 this year, the supervisor, Nip Moon-ho, 38, saw Cheung handing out leaflets to parents. She approached him and there was a dispute.