What are the 2 Corinthians verses in this section decrying?

Les explains that 2 Corinthians verse 15 shocked his listeners: it says all those in Asia turned away from Paul. He reminds us that Asia Minor was the New Testament Asia, where Paul had started many churches, such as Thyatira, Pergamos, and Smyrna. By the time Paul was martyred, they had evidently turned from his gospel, though the exact reason is unknown. Les calls this a heartache, since Paul had poured out his life for them. He sees the result in those little cities vanishing, while Greece remained. Then he says the following verses in 2 Corinthians are all decrying the fact that Paul suffered so much to get the gospel to these Gentiles.