“You said ‘ni hao’ to us, that’s not how you say hello and hi. Because of your attitude and disrespect towards me as a national park ranger, [your day here] has ended,” he told them.

Siranudh “Sai” Scott, 26, an adviser to the Department of National Parks Wildlife and Plant Conservation in Thailand, accused the couple of racism on the Krabi beach after they greeted him with “ni ...