While at anchor in the Shatt-Al Arab fellow cadet Dougie and I fell out with the Chinese second steward who for some reason objected to us eating our lunch in the duty mess. Eating in the duty mess was convenient. It meant that we did not to have to get cleaned up for lunch given that we were working on deck in boilersuits getting hot and sweaty. While the second steward very much resented serving anyone in the duty mess, he especially felt that cadets should not be taking their meals there. He complained to the chief steward, who complained to the mate (chief officer), who told us that we had to eat in the saloon. We were understandably annoyed and decided to take revenge.