DON'T Crisscrossing chopsticks
This point is often neglected by people, who place their chopsticks carelessly in a crisscross while having a meal. This is unacceptable because it implies the negation of all the other diners, much like putting a cross over the wrong answer on one's homework. At the same time, it shows disrespect to the host as in the past one had to put a cross and sign on the written confession when being charged.