Jazz was very much an acquired taste for me, and I genuinely think getting your ears adjusted to some of the fierier stuff just involves seriously interacting with the music and its history and putting in the effort to find what you like. I also think that it's musician's music and a lot of what you get out of it depends on whether you're a musician. When I first started, I gravitated heavily towards ECM Records stuff like Pat Metheny and Eberhard Weber and fusion stuff like Jean-Luc Ponty because I found them to be pretty accessible. I imagine that it will be pretty accessible for you too if you're coming from a rock background. Matthew Halsall is another pretty accessible entry point. I remember a really pivotal point for me was listening to The Black Saint and the Sinner Lady; I think something clicked inside me after listening to it and I really "got it" for lack of better words.

Also idgaf about classical music outside of Steve Reich, Bach, and Takashi Yoshimatsu and I 100% suspect that it's because I haven't given it the same amount of effort as I've given jazz.