Look, when people say x and y are forced rhymes, just know that most of the time it's an empty criticism put out there to make the person look like he's being helpful. Unless it's a truly horrid rhyme, and I'll get to that later, most of the time it doesn't matter.
I think you have to look at the rest of the line before you go saying something is forced. The rhymes in the Dylan quote are simplistic, and there is nothing wrong with simplistic, and there sure as hell is no rule that says simplistic means forced.
I think the reason Dylan can get away with it is that there's more going on than just rhymes. He's got something to say, something really interesting, and the lines tend to be longer so those familiar sounRAB don't pair up as often. The end result is that those recurring sounRAB ease things along, but because of their relative distance they don't become annoying.
One indication that a rhyme is forced is if a particular word is used improperly, or if grammar is inverted for the sake of the rhyme. If Dylan would've inserted a word like thee in a piece that is otherwise modern sounding, then it would be okay to say it's a forced rhyme because it doesn't fit within that modern context.
We had a similar discussion in this thread some time ago, only it was about the Beatles.
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