This topic may be dead, but I just had to throw in my $0.02...your annoying person is unbelievably wrong. Or joking.
Or you are joking.
Dylan is probably the quintessential songwriter's songwriter....perhaps there was a collaboration with Cale, but I'm not aware of it. Dylan did co-write a little bit, with Jacques Levy and even Robert Hunter (from the Dead), but the vast majority of his huge output was written by himself, words and music both.
As gr8fulbluz suggests, Dylan is known for writing songs that other people then covered (the Byrds and the Dead being notable among them). Not the other way around.