Well, you're half right -- it was a book.
The Japanese friends that he makes are grossly stereotyped and are kept one dimensional during the entire book as well.
The main character also strikes me as incredibly creepy, and to a level where he could be classified as an para-social stalker. Just comes off as being a terrible person overall.
Spielberg's movie however is fantastic and one of those rare instances where the movie truly does outrank the book.