Insofar as Japanese culture has anything to do with the way these people replied to you, I suspect that it might be a combination of (1) deference to authority and (2) relative isolation from the Western CS scene.

Absolute deference to man pages and insistence on getting things fixed upstream are textbook examples of, well, following the textbook. And they won't accept blog posts and presentations as authoritative because they are not familiar with the authors and presenters. Had they been even a casual reader of HN, they wouldn't dismiss names like tptacek so easily. They simply have no idea who the heck he is, so they stick to TFM as they were taught to do.

So it's neither malice nor xenophobia. I think they're just following rules, and maybe a little annoyed that everyone is telling them to ignore their rules.