Dylan had always liked rock and roll and Dylan didn't think of rock and roll as stupid music."
In fact, Dylan was a Beatles fan. He later said that from the first time he heard the Beatles he knew "they were pointing to the direction where music had to go."
"Honestly, once the Beatles hit, I think the writing was on the wall. But when Dylan went with the Beatles on that one: that was that. That was essentially the end of the folk scene as a huge mainstream pop trend.