Debates continued to rage online after a Hong Kong school principal was filmed verbally abusing two South Asian security guards in Singapore, with viewers divided over whether his behaviour reflected a lack of manners or racial bias.Lee Cheuk-hing, the principal of San Wui Commercial Society Secondary School in Tuen Mun, was caught on camera behaving badly and swearing at two security guards during a school trip to Singapore last Friday.While many criticised the principal’s lack of courtesy,...