I believe what you're saying is true to an extent. I play in a fast sort of punk/pop punk band and the guitarist and I are both "schooled" and listen to music that would be considered complicated. The three other members are "unschooled" musicians, and all listen to only the style of music we play (mostly simple.) Although, they tend to come up with some good songs that are fun to play, that's why we are in the band. And although we play simple music, i enjoy it even though i am a "schooled" musician. But when I try to get a little jazz jam going at practice the other three are lost. The drummer can't figure out a jazz beat for the life of him, the guitarist has no idea what or where to play, and the singer goes to get a beer. It's annoying, and I have had this experience with every single musician i've played with that is "unschooled." They think they are good because they can play their favorite bands (simple) songs, so see no need to drastically improve. The more complicated or difficult music you play, the more influenced you are to become a better musician. Unfortunately I haven't seen an improvement in their playing for the last year i've been in the band, it's like they hit a peak once they were "good enough".
Back to your point, I believe that the majority of people who are schooled musicians are more open to any genre and know that any type of music can be good if it's played well. Although, I truly feel that based on my experience that unschooled musicians are not as open to other genres, or more complicated music.
