How does the author use irony in the novel, One Is the Loneliest Number?

One Is the Loneliest Number is full of ironies. For instance, Roddy notes that "if you were careful and thoughtful, you could find a way to make a computer user's persona sick," yet what he is not is "careful and thoughtful." Instead, he is self-absorbed, an immature teenager who does not think beyond his own immediate feelings. Besides, he is not half as clever as he thinks he is—readers are likely to have figured out what he was up to long before it is revealed.