The essential social rules for visitors — what Thais actually care about versus tourist myths.
Remove shoes before entering homes and temple buildings; greet with sawasdee krap/ka + slight bow; return a wai if received; say thank you (khob khun).
Touch anyone's head (sacred in Thai culture); point feet toward Buddha images or people; touch monks (women especially); photograph without asking; raise your voice in public.
Dress modestly (shoulders and knees); shoes off inside; speak quietly; don't turn your back on Buddha images when leaving; no shorts — wrap sarongs available at major temples.
Stand during the national anthem; never disrespect images of the royal family; don't deface banknotes (King's image).
Pointing with one finger is rude? Not really — just avoid pointing at people directly; left hand is unclean? Thai culture doesn't observe this as strictly as in India.