What specifically causes that mood?

The novel Catcher in the Rye is narrated by a cynical, and somewhat bitter teen named Holden which causes the novel to have a negative mood. Throughout the book, every person he meets, he never hesitates to mention the flaws of the person he is describing. Holden described his life with a hatred passion, and he also had the power to make you hate everyone he ever thought about. There are many moments in the novel where Holden complains about different people, including his ex-professor, Mr.Spencer. Holden goes on about how he strongly dislikes talking to him. 'The minute I went in, I was sort of sorry I came.'(7) Even though Mr.Spencer seems like a nice person who genuinely cares about how Holden is doing in school, Holden still makes you dislike him because of the negative comments that he describes him with. Not only does the negativity come from describing his elders, they also come from describing his peers, such as Ackley. Holden describes Ackley's terrible teeth and tall rounded shoulders with disgust. Although at times it was humorist to read what Holden had to say about other characters, it also brought down the mood and could get aggravating, wanting him to not be so judgemental and harsh.