It was actually meant as a bit of a sarcastic comment, since, after all, they have to listen to their own creations. Merit doesn't grow out of snobbery.
Good music is "hard to listen to", which means that on the first listening, you won't pick up all the subtle details in the rythm, undertones or even the lyrics.
Very true. Much in the same way that a fine piece of literature will not expose itself in the first [or first several] reads, quality music requires attention, on the parts of both the listener and the composer, to be fully appreciated.