Ugh, despite being a hardworking salaryman, you sure have a very dumbass way of explaining rice. In the first place, boiling the cereal before eating is not exclusive to rice. You do the same with barley and corn. They have bread, so they would know this cooking method. Instead of saying you don't know, you should point him to barley which you certainly have right on that same table.
Man, even FUNA isn't this ignorant.