Bitter tone is implied by the narrator’s description in the passage above from “Marigolds.” Bitter tone is a tone that can be expressed by showing displeasure, anger, disappointment, fear, dissatisfaction or feeling of disgust towards a particular thing or a person.
Bitter tone is implied by narrator because he mentioned Miss Lottie's house most badly among all the badly made houses. He even states that house looks like it is made by a child with cards means that it can fall any time. At the end she even stated that it is a monument to decay. This extracts clearly states that narrator used bitter tone for expressing house.
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