In an interview on Fox News, journalist Glenn Greenwald insisted that he was not a “sell-out” to the conservative movement. Howard Kurtz, the host of the Fox News Media Buzz program, interviewed Greenwald on Sunday about his shift from appearing on traditional media outlets a decade ago. “You get that a lot,” Kurtz noted of the criticism. “‘I loved you as a left-winger. Why did you sell out and become a right-winger?’ What’s the larger message about journalism when you hear those kinds of critiques.” Greenwald, however, insisted that it was his former fans who had changed. RELATED: How is manu…