I think you guys are missing the single most important aspect of the situation: bi-directional snobbishness.
In the U.S., particularly, lo-o-o-o-o-ng before Rock and Roll (or even Pop), an attitude developed that symphonic music could only be enjoyed by the cultural elite. One reaction by hoi polloi was to dismiss symphonic (with its relatives opera and ballet) as stuffy. There are cartoons from the late nineteenth century ridiculing the idea that laborers could possibly “appreciate” what is often called “classical.” If you watch old Fred Astaire movies on AMC, you will see that theme worked over again and again. As a result, people tended to listen to what they were “supposed” to listen to according to their social station. In the 1950’s that sort of thing got a boost as radio stations began looking for “market segment.” From then on, people would tend to only hear certain varieties of music. By the early seventies, this had stratisfied to the point where different stations only played specific sub-genres of an idiom. (In the mid-60’s, your typical Rock and Roll station played Beatles, Rolling Stones, Bob Dylan, Peter, Paul and Mary, Blues Magoos, Cream, Frank Sinatra, Nancy Sinatra, Tia Juana Brass, Dionne Warwick (don’t remember the exact spelling of her name in those pre-numerology days), the Love Theme from Romeo and Juliet, and others–try getting that variety even from an oldies station, today.)
As kids grew up listening to a limited range of genres, they began to listen to only music they found comfortable–meaning they were used to it.
I notice that my kids (12 and 9) really get into the stuff that is on the currently popular Rock station that they hear their child-care workers play after school and summers. However, they also really get into a lot of the “Classic Rock” that I play on the car radio. In addition, they enjoy Celtic music, Symphonic Music, and show tunes which they hear at home from CDs or on the local Symphonic station. The sounds that they don’t seem to enjoy are tunes from Cream, The Doors, Iron Butterfly, and a whole slew of late sixties stuff that I have only a few recordings of and that don’t tend to get played on “Classic Rock.”
In other words, everything they hear regularly, they have developed an ear for, while everything that is rarely heard they tend to reject.
I do not believe that there is any technical aspect that puts people off from any genre. I suspect that if you hear it enough, (provided you aren’t nauseated by it and refuse to “get used” to it), you can appeciate most forms of music. In the last couple of years, I have gotten to where I can distinguish enjoyable from hated Zydeco tunes, where ten years ago I’d have run screaming into the night at the mention of Beau Soleil or any similar group.
Tom~