เข้าเมืองตาหลิ่ว ต้องหลิ่วตาตาม

“Entering a town where people squint, you must squint along too.”

Adapt to local customs when you are in a new place — the Thai equivalent of 'When in Rome, do as the Romans do.'

— Traditional Thailand Wisdom, Thailand

Source: Traditional Thai proverb, public-domain oral tradition