Bruno thinking it is unfair that Shmuel has friends while he has none despite the fact that Bruno actively insults and pushes away everyone around him, including Shmuel, is ironic because it demonstrates a lack of self-awareness and accountability on Bruno's part. It is an example of situational irony in which the audience sees the contrast between Bruno's self-imposed isolation and his feelings of being victimized by others. This disparity creates a humorous and slightly tragicomic contrast that adds depth and pathos to the character.