"pursuit of the truth" is an ideology. What are you trying to say here?

Glenn is, essentially, hypocritcal because he ignores things that go against his predetermined narrative.

Does he post true things sometimes? Sure, but is it really worth filtering through the rest?

I think what they are saying is a common sentiment among people who don't belong in any of the major political camps. It's a common experience to take heat from all sides because, surprisingly, neither "side" in politics is perfect nor particularly virtuous.