Honestly, ever since I grew out of my teenage prog snob/music elitist phase, I've developed a "live and let live" attitude regarding music. If, for example, some friends have bonded over their love for Nickelback or Justin Bieber's songs have helped someone through rough times, then who am I to take that away from them? I may not be into stuff like that myself, but I wouldn't wish they never existed simply out of selfishness.