Recently just found out a so called instructor opening a muay thai school close to my house is a fraud. He claims he fought at Lumpinee and Rajadamnern stadium in Thailand, but obviously never did. Claims he was a bad ass pro boxer himself before he became a pro muay thai fighter in Thailand, but that's also a lie I have evidence to back up the fact that he's a fraud. What are the etiquette of outing a fraud? I just hate to see people wasting their hard earned money on learning from a fraud.