Here is the link. The context is nutritional science and epidemiology, but confirmation bias is the primary theme pumping throughout the discussion. Gary Taubes has gained a reputation for contrarianism.* According to Taubes, the current nutritional paradigm (fat is bad, exercise is good, carbs are OK) does not deserve high credibility.

Roberts brings up the role of identity in perpetuating confirmation bias--a hypothesis has become part of you, so it has become that much harder to countenance contrary evidence. In this context they also talk about theism (Roberts is Jewish, while Taubes is an atheist). And, the program being EconTalk, Roberts draws analogies with economics.

*Sometime between 45 and 50 minutes in, Roberts points out that given this reputation, Taubes is susceptible to belief distortion as well:

What's your evidence that you are not just falling prey to the Ancel Keys and other folks who have made the same mistake?

I do not think Taubes gives a direct answer.