Why does Johnny think that Dally is like Southern gentlemen from the novel Gone with the Wind?

In Chapter Five, while Ponyboy and Johnny kill time by playing cards and reading Gone with the Wind. Johnny becomes interested in the idea of gallant southern gentlemen, and says he thinks that Dally is most like them. Ponyboy is shocked, but realizes for the first time "the extent of Johnny's hero-worship for Dally Winston."

"I bet they were cool ol' guys," he said, his eyes glowing, after I had read the part about them riding into sure death because they were gallant. "They remind me of Dally."

"Dally?" I said, startled. "Shoot, he ain't got any more manners than I do. And you saw how he treated those girls the other night. Soda's more like them Southern boys."

"Yeah... in the manners bit, and the charm, too, I guess," Johnny said slowly, "but one night I saw Dally gettin' picked up by the fuzz, and he kept real cool and calm the whole time. They was gettin' him for breakin' out the windows in the school building, and it was Two-Bit who did that. And Dally knew it. But he just took the sentence without battin' an eye or even denyin' it. That's gallant."