It's something I've read suggested about others but my observation of the current trend runs like this.

If someone finds a folk song that is popular sounds like a pop song or find it bland and say so, they will find others say it is because they dislike the idea of folk (or folk artists) being popular.

If someone says they don't really think a popular artist represents the best they have heard in folk, they will find others say it is because they dislike the idea of folk (or folk artists) being popular.

And so it goes on.