Yeah, I certainly won't judge people if they don't absolutely love music, or at the very least don't get out of it as much as I do. I actually tend to have somewhat narrow tastes, but I delve deeply into them and mine out everything I can get. It's a reflection of my personality in general, actually. Lots of other people have really eclectic tastes but don't, for instance, collect a large part of an artist's discography. If they buy classical, they'll get one of those "Beethoven's Greatest Hits" discs rather than collect up different performances of the same piece or try to find one preferred recording of each of the nine symphonies. To me, the texture and tone of the different instruments and the way it all fits together is a big part of my enjoyment. To others this might be less important.
There are plenty of other contrasting examples I could make. All this adds up to music being just another interest for a lot of people, rather than an important cornerstone of their lives. I have interests like that, too, that don't matter as much. The TV in my room is an old 32" SD tube one, which I've never even considered upgrading because television just isn't that big a deal to me. I have games I bought years ago which I've never completed. In fact, nearly all of them are like that. I'm just not a huge gamer.
Still. A life where Miley Cyrus is equivalent to something by Jethro Tull? I can't even imagine what that's got to be like.