I'm not really sure how anyone can write off an entire genre like opera like that. Not every opera is like that.
I like what is considered modern classical music (Satie, Stravinsky, Zappa, Varese, Antheil, Nono, Takemitsu, Webern, Debussy, Ives, it goes on and on and on) Totalist classical music (Gann, Rouse, Ashley) and minimalist classical music (Specifically Riley and La Monte Young. Out of Glass and Reich I prefer Reich, but I don't like most Glass, though he's done some fantastic stuff.)