Malaysians are generally very polite and dislike confrontation, and you'd do well to bear in mind the following points of etiquette:
Keep calm Try to avoid raising your voice in anger. A dispute is more likely to be resolved through calm discussion, and a smile often goes a long way.
Greetings Handshakes are usual when meeting someone for the first time, although some Muslims prefer not to shake hands with someone of the opposite sex.
Pointing Don't use your index finger to point; use your thumb instead.
Shoes off Always remove your footwear before entering someone's home.
Right handed Use your right hand to eat, in shops, when shaking hands or for any other transaction. The left hand is reserved for unclean acts.