Lord Haseo said:
It means that doing a back and forth would be an act in futility because even if you show empirical evidence as to what you’re talking about he’ll just deny it or say that you’re not providing an actual argument.
No worries. I don’t really care about convincing anybody. Just thought I could offer a view from somebody who might be more familiar with the accent than others. Somebody else living in Japan might not even agree with me.