What is the significance of the title blues ain't no mockingbird?

It is possible, that following the same idea as expressed in Lee's To Kill a Mockingbird, that mockingbird's do nothing but sing and make beautiful noise.....that the true essence of the blues are nothing like a mockingbird. The blues should be heard and appreciated for the heartbreak that they are and not as a the beautiful sound that is made by the actual mockingbird. The title is simply, in my opinion, saying that the blues are nothing to ignore or scoff at because they are expressing true, raw, human emotions that need to be validated.