Yes But Not with an onewayticket.The Airline won't let him go. So He has to get a Visa or an onward ticket out of Thailand within the 60 days of visaexeption.
Married to Thai 36 years live in Thailand now for 10 years and come to Thailand since 83 and speak Thai and the CM dialect fluent.I boicott every place ,which has different prices for Thais and Farang now for 40 years.
The rule Is not more than180 days a year in Thailand.borderruns are 2 times on landborders and how much you can by air.So the 180 days are the rule.1 borderrun with extention=180days.After that time you have to Look for a visa.