What is the author's tone in Born on a Blue Day: Inside the Extraordinary Mind of an Autistic Savant by Daniel Tammet?

The tone of the book seems to be a mix of subjective and objective. The author's autism gives him an objective tone towards most things that average people assign emotions to. In fact, the author notes several times throughout the book that he has no particular feelings about his siblings or schoolmates. Daniel does not enjoy socializing with other people. He views his classmates as nuisances and prefers to spend recess alone. Instead, he prefers objects like books, and concepts like numbers. Daniel's world seems backwards; towards people, he is objective, towards objects, subjective. Numbers and routines comfort him. He describes languages as friends and peers as frustrations.