The speaker is frustrated with people who seem to enjoy being miserable and who take pleasure in making others suffer too. The poem argues that you shouldn't expect kindness from someone like this, and it paints a picture of why: he lives in a "fantasyland," a glass castle where he looks down on everyone and laughs, convinced he is better than the rest. His view of the world is like tunnel vision, with himself always at the center, seeing good only in himself.
The most striking feature is the form. Each line ends with a word or phrase that the next line picks up again, like a chain ("other than / Other than the joy they obtain"). That repetition makes the poem feel like a grievance being turned over and over, or like a link-by-link argument. The mood is bitter and weary, but also resigned. The speaker ends by noting that this man isn't alone, and the closing repetition of "no love" sounds like a settled conclusion rather than a hopeful plea.