How could anyone not agree with this, rap fun or not? Good message for any music.There are so many problems with this discussion, I'm not even going to try.
But this is for Mutatis-Mutandi (with respect):
I think that your understanding of musical "taste" is very off-base from what the word should signify to the contemporary listener who is serious about music as an art form. Taste in music is not about restricting yourself to "superior" works that are more virtuosic or serious than others, thereby accruing a sort of cultural capital with which to establish yourself as a higher class person than other listeners.
Taste signifies your ability to appreciate the experience of music on a deep and affective level. In the classical tradition of music, the intention and craft of the musicians is geared towards this kind of deep experience from the get-go. As a fellow worshipper, you probably know what I mean.
But where does this depth come from? Is it purely a matter of how much effort is put into the work, how much virtuosity it displays, or how "serious" it is? No - these are important attributes to the music, certainly, but they are not the source of its depth. Great music is always a response, a reaction of the artist to the profound musicality they have discovered in the world around them. And this is the true meaning of "taste" - one's ability to tap into and appreciate the musicality of their world. For example, Bela Bartok (my favorite composer) was very powerfully affected by simple (what you might consider intellectually vacant) Hungarian folk tunes, and in his vast and utterly incredible body of work you will not find one piece of music that is not fundamentally marked by this experience. Morton Feldman, another giant, was far more interested in the sonority and sonic potential of the piano itself than any complex or virtuosic composition that was played on it.
So, my point is: writing off a genre or style of music because you do not find it intellectually stimulating is a flaw in your taste, not a virtue. Closing yourself off to any kind of musical experience is a symptom of dull-mindedness and non-musicality. The only reason you would ever pride yourself on a closed mind is to establish your own experiences as superior to those of others, which is the highest form of arrogance. Music is not an intellectual pursuit; it is a sensuous, full-body-mind experience whose appreciation completely transcends the intellect. And as a fellow serious listener, I must say that there is more than enough of this in Hip Hop to establish it as a legitimate genre of music.