"Is this because traddies are being too picky all the time?"
No it isn't - it is because, while I have very wide tastes in music, I prefer to be able to choose what I listen to and when - nothing whatever to do with likes and dislikes.
By calling badly (or well) performed pop songs, music hall, light or heavy opera, swing...... 'folk', you are operating a con and removing my right to choose.

A man walked into a shop and asked for a tin of tomato soup. The assistant handed a tin to him, and when he looked at the label he saw it was mushroom.
"I asked for tomato".
"I don't stock tomato; what's the difference; it's all soup?"

Stupid joke; stupid situation; but it happened to me and thousands like me over and over again in the 80s until we got fed up with being conned and stopped going to clubs. The revival lost upwards of half of its national audiences, its radio and television air space, its magazines, its integrity and its identity. The club scene has been staggering from crisis to crisis ever since.
Jim Carroll