Thais, like anyone else can take offence. If you see a row of shoes outside a room/office etc, it means people are taking off their shoes before going in. Don’t wait to be asked, if you want to go in, take yours off. If you visit a temple you must remove you shoes. Do as the Thais do. If you must get down on the floor, fold your legs beneath you so that your feet point away from the Buddha. Wear appropriate clothing. Don’t wear shorts mini skirts or short-sleeved shirts. Cover yourself.