Why does most new music suck?

I often find what a favorite Artist of mine has to say about another Artist (or entire genre). In the 60's Bob Dylan said Smokey Robinson was our greatest living poet. Not long ago he expressed his approval of and interest in current Rap. Bob has always been far ahead of the curve, but in this case I'll just say he and I will have to agree to disagree. I was also "supposed" to like The Clash, and didn't.

Oops, my first sentence is incomplete. The last word was to be "interesting".

OP is simply begging the question.  Logical Fallacy 101. 

I was listening to some modern hip hop with some much younger friends (I look about 15 years younger than I am) and put on Talking Heads crosseyed and painless.  The 21 year old girl started grooving to it immediately.   I explained it was made in an era before protools and auotune.   
Even though not my genre, old disco has a much higher level of Musicianship than much of dance music today, which is designed to be disposable.   
There are however bright spots in artists  like Regina spektor, who was Classically trained in Russia, and her pop music shows the complexity of those musical influences.  
Similarly, someone growing up in a diet of Macdonalds would never develop the palette for gourmet (or even whole) food, I believe that's what's fueling the disposable and simplistic music of today.   
I was surprised to find several years ago that my teenage nephew liked Frank Zappa, so there is some hope I suppose.