How we cite our quotes: (Book.Chapter.Paragraph)
Quote #4
Amory was now eighteen years old, just under six feet tall and exceptionally, but not conventionally, handsome. (1.2.194)
Sure, Amory might not be conventionally handsome, but this is just Fitzgerald's way of saying that he's handsome and unique. So it's really a double compliment.
Quote #5
"The light-haired man is a higher type, generally speaking. I worked the thing out with the Presidents of the United States once, and found that way over half of them were light-haired—yet think of the preponderant number of brunettes in the race." (1.4.83)
Burne Holiday has done some research and discovered that there is a disproportionate number of light-haired presidents of the United States. The overall point he's making here is that people inherently have more trust for people with light hair, which: wow. Way to be all sorts of racist there, Burne.
Quote #6
But all criticism of Rosalind ends in her beauty. There was that shade of glorious yellow hair, the desire to imitate which supports the dye industry. (2.1.47)
Sure, you can criticize Rosalind's personality all you want. But you can't criticize her beauty. Even if you thought she wasn't good-looking, you'd be objectively wrong… according to Fitzgerald's narrator.