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

Cherry, or Sheri Valance, is a character in the novel The Outsiders. She is a Soc girl from the west side of town, where the rich kids live. Cherry meets Ponyboy at the drive-in theater when he goes with Johnny and Dally. Cherry and her friend Marcia are seated in front of the boys. Dally begins to mess with Marcia and Cherry, which leads to an altercation and Cherry throwing a soda in Dally's face. Afterwards, Cherry and Marcia invite Ponyboy and Johnny to sit with them, describing them as “too sweet to hurt anyone” and as gentlemen.
During the movie, Ponyboy and Cherry get a chance to talk. Ponyboy tells her about his brother Sodapop dropping out of school and how Johnny had gotten jumped by some Socs. Cherry explains that not all of the Socs are bad, just as not all of the Greasers are like Dally (who she says has probably jumped someone). After the movie, the Greasers realize that Cherry and Marcia have been left and do not have a ride home. Two-Bit offers to drive them home.
On the way to Two-Bit’s car, Cherry explains the difference between Socs and Greasers. She says that part of the difference, but not all of it, is money. She says,

You Greasers have a different set of values. You’re more emotional. We are sophisticated . . . cool to the point of not feeling anything. Nothing is real with us.