Why did the audience at Newport folk festival in 1965 boo Bob Dylan?

The audience at the Newport Folk Festival in 1965 booed Bob Dylan because he performed with an electric guitar and a rock band, which was seen as a betrayal of his folk music roots. Folk music was traditionally performed with acoustic guitars and often had a political or social message. Dylan's decision to "go electric" was seen as a move towards commercialism and a departure from the authentic folk music that the festival attendees had come to expect.