Things that will be considered impolite:

1.) Sticking your “chopsticks” or spoon upright in your rice or food. Leaving utensils like this is something they do to respect the dead…not something for the regular meal.

2.) When on the subway or train don’t sit in the handicapped/elderly/pregnant seats, even if no ones there, no one else will. Of course if you are elderly, handicapped, or pregnant use these fully. Warning: using these seats without cause can get you publicly berated.