You can find bad examples in every culture, but a Luxury Hotel is a Luxury Hotel in most all countries. Maybe you have never been to the Savoy in London or the Claridge, the George V or the Meurice in Paris, the Dolder in Zurich, or similar hotels around Europe? And there are other examples every region around the world. Would you walk into a Luxury Hotel in Tokyo in flip-flops? Why should you castigate the MO in BKK for requiring the same example of luxury?