If the year was 1962, 1963 or 1964 I'd have to agree with you. If it was early 1965 his style was "folk rock". In fact, with some help from The Byrds, he invented that genre of music. After that though, and including "Like A Rolling Stone", he was a rock star through to 1967 when he became a folk singer again. In 1969 he went country. To cut this short there aren't many musical styles that Dylan hasn't tried. Some more successful than others.
These days, he's gone full circle and he's back to being a folk and blues singer. But when he was rock star, he was up there with the best of them.