Gang of Four
The Mountain Goats
Part of it is just maturing, I think, and not needing everything to be accessible. But I liked bitter, weird, dissonant, and generally obscure crap starting very young. I can't explain those taste changes. Glad I enjoy all those things now.
The list of things I liked and now despise is shorter, more boring, and pointlessly negative so I won't share. Most of them are pop culture that I liked because of some personal context and then realized was shit, or things I enjoyed because I was immaturer and later found the real version thereof.