What does Cherry explain as the difference between Socs and Greasers?

At the beginning of chapter 3, Ponyboy has an enlightening conversation with Cherry Valance regarding the differences between the Socs and Greasers. Cherry explains to Ponyboy that money is not the only difference between the gangs. Cherry explains her social group as being one big rat race, where everyone is only concerned with their reputations and outward appearances. Cherry essentially tells Pony that the Socs are superficial, callous individuals who are selfish and cold towards each other. She also describes the Greasers as being more emotional and authentic. Cherry recognizes that the Greasers are a close-knit group of friends, who genuinely care about each other. Ponyboy considers Cherry's explanation of what makes the Socs and Greasers different and agrees that the Socs are more aloof, callous individuals. After Cherry describes the differences between both gangs, Ponyboy says,

That's why we're separated . . . It's not money, it's feeling—you don't feel anything and we feel too violently (Hinton, 34).