Nick scolds Gatsby because he feels Gatsby is being unrealistic in his pursuit of Daisy and naively believing that he can recreate the past. Nick is trying to make Gatsby understand that Daisy is different now and may not live up to his romanticized image of her.
Gatsby, in order for his new persona that he has created for himself to work [being an "Oxford" graduated young gentleman] feels that this is an appropriate expression to use; yet Tom confronts this later in the book, just before Myrtle is ran over.
What I gathered from Gatsby's use of 'old sport' is that he is trying to solidify the illusion of being educated at Oxford. 'Old sport' was seen by Jazz-Age Americans as a British slang term of endearment, so the fact that Gatsby uses it shows that he is close friends with Nick while still maintaining the facade that he was educated in Oxford, England.
Nick scolds Gatsby for being too focused on the past and unable to move on from his pursuit of Daisy Buchanan. He criticizes Gatsby for not being able to accept reality and for clinging to an idealized version of the past that is no longer attainable.
Gatsby recognizes Nick from the war when they were both served in the same division. Nick mentioned to Gatsby that he was from the Midwest, which caught Gatsby's attention.
Nick and Gatsby met at a party that Gatsby threw at his mansion in West Egg. Gatsby had been watching Nick's house from across the bay and purposely chose to introduce himself to Nick.
Gatsby tells Nick that he is from San Francisco.
Nick receives an invitation to Gatsby's party through a formal note delivered by Gatsby's chauffeur.
Gatsby offers Nick work as a gesture of gratitude and to strengthen their friendship. It also serves as a way for Gatsby to involve Nick in his extravagant lifestyle and to keep him close by as a confidant.
Gatsby didn't know Nick orgionally. He met Nick at his party for the first time.
nick carraway
nick carraway
When Nick meets Jay Gatsby shortly after midnight, they talk about Gatsby's past and how he came to acquire his wealth. Gatsby tells Nick about his time in the war and his longing for Daisy Buchanan, whom he loves. Overall, their conversation revolves around Gatsby's mysterious persona and his connection to Daisy.
In "The Great Gatsby," only Nick Carraway, Gatsby's father, Owl Eyes, a few servants, and a minister attend Gatsby's funeral. All the characters who frequented Gatsby's lavish parties during his lifetime abandon him in death.
Nick describes Gatsby's handwriting as "romantic."