A true story: Person waiting for an appointment with a Thai in Bangkok. Waits half an hour, no show so rings on mobile. Says he is near Sukhumvit Soi xx in heavy traffic. Knowing the area, waits half an hour. No show, rings again. Traffic heavy, be with you in 10 minutes. The guy was actually in Chiangmai and another Thai had to explain the "excuses" were to avoid the person getting upset. You see many Thais think differently. No right or wrong - just different.