People that aren't cross-trained get so emotionally invested in their particular side that they get snotty. It's like Ford and Chevy owners... they're just cars, but people get so into their own side that they lose some of the bigger picture. I'm studying saxophone in college, and though I don't claim to be great at either side, I can definitely say both sides have really helped me to mature as a musician and as a person. I think the biggest thing is that some people believe that in order to excel far enough in either side you have to delve so far into it that there isn't anything else but that. In reality, one of the best saxophonists I've ever met is a fantastic player on both sides. He's a very charismatic jazz player, he studied in France with Jean-Marie Londeix, won the International Geneva Saxophone Concours, and is also a great bassoonist! What people should realize is that everything more or less blends into the same melting pot at some point. I've met classical players with unbelievable technical ability, and I've met jazz players who can come up with solos that are beyond brilliant... imagine someone who could do both.