"O'Reilly continues to hide behind his microphone"

This quote is describing Bill O'Reilly, a former Fox News host, and his propensity to utilize his platform to spread his own personal views and viewpoints. By stating that O'Reilly is "hiding behind his microphone," Robert Greenwald is indicating that O'Reilly is utilizing his microphone as a guard to safeguard himself from criticism and responsibility. He is utilizing his microphone to spread his own views without needing to deal with any consequences for them. This quote is also suggesting that O'Reilly is using his microphone to control and manage the story, rather than to provide a truthful and impartial viewpoint. By hiding behind his microphone, O'Reilly is able to spread his own views without needing to face any criticism or accountability for them.