Question

Why did the ghost feel humiliated when Mr. Otis offered him the lubricant? What idea do you get about his personality from this incident?

Answer 1

In "The Canterville Ghost," the ghost is humiliated by the Otis family after his very first ... dear sir," said Mr. Otis, "I really must insist on your oiling those chains, and have brought  

Answer 2

The ghost felt humiliated when Mr. Otis offered him the lubricant because the ghost wanted to make the family feel scared of him but instead of scaring they were behaving in a much cool manner. The ghost made a clinking noise in order to share them but Mr. Otis replied to the ghost suggesting him to add lubricant in the chains.

this incident focuses on the idea that the Otis family do not felt scared about the ghost. Because of this, the ghost had started to be frustrated and irritated.