This seems like a very one-sided opinion/experience. While I've certainly had my own share of odd experiences and heard similarly odd stories, this doesn't really strike me as specific to The Netherlands as a whole.
To me is specific to there because while I’ve had weird experiences somewhere else, it was not as consistent, so in my own experience (guess I need to specify the obvious) it's more likely to end up in weird codebases there than somewhere else, again, in my experience
Was always wondering why people say on their blog that opinions are their own