Look, I get it. You're old, you're white, you grew up on classic rock. However I bet your parents or your elders hated rock and said the EXACT same thing about. My grandfather was a huge lover of classical music, thought everything else was mindless, talentless noise. How hard is it to play loud? He'd always ask.
It's a generational thing. There are now more ways to make music than just an instrument. The amount of technique that goes into sampling is staggering because you are literally taking multiple sections of multiple songs and making something new out of. That does require musical talent. I know classically trained musicians who cannot do that for the life of them.
Jay Z made a lot of his fortune not only through rapping and actually being a very savvy businessman like Dr. Dre, but also like Dr. Dre he made it via producing music. Recording, arrangement, mastering, and making the "beat" the track behind the rapper.