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"About Gatsby! No, I haven't. I said I'd been making a small investigation of his past."
"And you found he was an Oxford man," said Jordan helpfully.
"An Oxford man!" He was incredulous. "Like hell he is! He wears a pink suit." (7.130-132)
Apparently, Latin isn't the only thing you learned at Oxford in the 1910s: you also learned not to wear pink suits. The point here is that education isn't just about reading the classics; it's also about learning to act (and dress) like a member of your class. And you can't learn that from a book.
He nodded sagely. "And what's more, I love Daisy too. Once in a while I go off on a spree and make a fool of myself, but I always come back, and in my heart I love her all the time." (7.251-252)
It's totally okay for Tom to have his little affairs, because he really loves Daisy. Yeah, we're so sure that excuse works for her.
"Who wants to go to town?" demanded Daisy insistently. Gatsby's eyes floated toward her. "Ah," she cried, "you look so cool."
Their eyes met, and they stared together at each other, alone in space. With an effort she glanced down at the table.
"You always look so cool," she repeated.
She had told him that she loved him, and Tom Buchanan saw. He was astounded. His mouth opened a little, and he looked at Gatsby, and then back at Daisy as if he had just recognized her as some one he knew a long time ago. (7.79-82)
Rich people—they can't say anything directly. Everything is done through innuendo and suggestion—like Daisy's bizarre confession of love.