Why is Sir Simon angry with the Otis family in “a dreadful discovery”?

In "A Dreadful Discovery," a short story by H.G. Wells, Sir Simon is a ghost who is frustrated and angry with the Otis family because they do not react to him as he expects. Rather than being frightened or respectful, the Otis family treats him with indifference and even humor. They approach his haunting with a dismissive attitude, using modern conveniences like a vacuum cleaner to address his ghostly presence. This lack of fear and respect infuriates Sir Simon, highlighting the clash between traditional ghostly expectations and the modern, pragmatic approach of the Otis family. This dynamic creates both tension and humor in the story, showcasing the conflict between the supernatural and contemporary attitudes.