>>127743190
Folk wasn't really pop music, it was a different branch.
The Beatles, along with rock n roll and pop music, were really considered "teenager's music" at the times, a product for the kids (like rock n roll, rhythm and blues...) or casual listeners (easy listening, novelty songs, doowoop, etc), and generally ignored by the serious, adult society. Those two worlds were VERY divided.
Rubber Soul was really the one where serious critics and music started to look towards pop music and notice that there were some interesting things there, and The Beatles were basically the band at the forefront of that idea, especially when Leonard Bernstein's started praising and analysing their music on TV.