Doesn't dictate my musical taste at all; however it does influence what I listen to. For rock I will typically use my speaker rig, and even more so, my portable rig. Personally I found the craptastic nature of most rock masterings (modern rock/metal) has helped me broaden my musical horizons quite a bit and in turn discover some excellent music along the way. I have spent close to 4 decades listening to tons of rock and metal and gone to more concerts than I can remember so it isn't that I don't still really enjoy rock, it was the soundtrack of my youth after all. We used to actually have records so waiting for the new Iron Maiden or Metallica albums to come out was the bomb. I just can't listen to a great deal of it with revealing headphones. Regardless of my age, the quality of the sound always mattered. When I was young my father came home with a nice enough Pioneer receiver (from the vaunted SX family) and some very nice Celestian speakers (eventually we had some bad ass HPM 100s). My older brother also purchased some Sony headphones so from the time I was about 10 decent musical reproduction was important.
Back in the day even a bad recording by todays standards still had dynamics left in it so you could still crank it up nicely. That is also another factor that today prevents me from enjoying rock music with revealing headphones, I like it loud, and if you want to hear just how "wall of sound/noise" rock recordings today often are listen at the levels I do and I think you might have a little sympathy for my position. Doesn't stop me mind you. Today on the bus to work I played Dream Theatre, Tool and Chevelle. Tonight at home with my 560s, it will mostly be Steely Dan, Peter Gabriel, Tears for Fears and some yummy electronica which sounds amazing with the 560s so even some modern music makes it for me there.