Final answer:
Nick's statement contrasts with his attitude at the beginning of the novel, showing a shift in his feelings towards the people around him.
Step-by-step explanation:
Nick's statement "I'd had enough of all of them for one day, and suddenly that included Jordan too" contrasts with his attitude at the beginning of the novel because it shows a shift in his feelings towards the people around him, including Jordan Baker.
At the beginning of the novel, Nick is intrigued by the wealthy and glamorous lifestyle of the people he meets, including Jordan. However, as the story progresses, Nick becomes disillusioned with the superficiality and corruption of the people he encounters, leading him to distance himself from them.