I remember one specific scene: a family (adults in suits) is having a formal lunch/dinner. A boy (about 10–12) sees a Black man at the table and, out of fear or ignorance, says the man is a cannibal. The boy is scolded by a middle‑aged man (possibly an uncle or tutor). Later, the adult leaves on a train and laughs with the boy about that dinner incident at the train platform with one or two others. The movie is in color and not a horror film. Any idea what movie this is?