Young people are going to prefer content that caters to their cultural zeitgeist and worldview. This is why new media is continually made and we don't all just listen to Mozart.

Everything changes and evolves. Fashion, music, games, young adult fiction, memes.

You wouldn't limit yourself to your grandparents' taste, would you? (I didn't say parents because some kids are instilled with parental preferences. I grew up around kids in the 00's who said the Beatles were the peak of music - obviously learned preferences straight from their parents.)

You might not understand youth culture because you grew up before them and have different tastes. We're imprinted with preference and nostalgia for our youth, and we can see changes to that as a hideous affront. The next generation is meanwhile going through the same cycle we did.