Because I think I've just taken in a lot because that's what I'm supposed to know.
I do have music I like, but it also tends to be simpler. Song and dance. A nice melody with rhythm. There are other things, but I do notice that trend.
Sometimes I'm thinking, This is "great" music because I've been told it's great. That's another thread though -- What makes music great -- from a long time ago.
But how do you develop taste? And what is good?
My thinking...
Exposure.
Some type of standard about what is good based on the sound or idea. That automatically means another style is "bad" based on those standards.