The reason you say that modern country is the "worst music ever" is because you grew up loving that genre and it hurts to see how it has been poisoned by rampant commercialism. "Music" executives have done to country music what they always do. They try to dumb everything down to make it palatable to as wide an audience as possible. That is all they care about. Not the quality of the music or the history of the genre itself.
That being said, it's not even close to the worst.
Rap is the king of bad.