The sad truth is that I find myself (rather hatefully) concluding that this is because they have never really bothered to listen to such. Classical music is, to me, so varied a genre that I could never imagine dismissing it so casually. There are several pieces of classical music I do not like (Enter the Gladiators comes to mind most readily) but many, many more that I do.

He is Croatian and cute and a very capable piano player. Dibs, anyone?
Flight of the Bumble Bee (orr: Rachmaninov)
Revolutionary Etude (orr: Chopin)
motto, motto sora no hate made, kake nukete iku only one ...I miss my Kaiser... :)