Even that's debateable. He's using the tactic of "change the subject" once he's cornered with facts.
He may not be a DUer, just a garden-variety protestant who's been taught to hate Catholics.
My parents are Episcopalian (their bishop is a lot more conservative than our former bishop, so they're hanging in there) but my mom was raised old-fashioned Calvinist Presbyterian, and she's having a pretty hard time with our having converted to Catholicism. She just automatically believes everything bad she hears about the Catholics, I'm sure it's because all she heard when she was a kid was other bad things (not the same bad things - it just changes all the time. When she was a kid it was mostly World Domination and Taking Over the U.S. Government).