You disagree about the nature of folk music. [Jim]'s convinced he is right. He is dismissive of the music that does it for you.

Why not pay him the same courtesy?

Because the way he comes across makes people who love traditional music look like hate-crazed bigots. And hardly any of us are like that. He's conducting black propaganda against the whole trad scene and repelling people who might otherwise be drawn to it. We can't tolerate that behaviour.