I wouldn't hate the big 12 half as much if they hadn't screwed with our tradition. Sorry CU people, no offense meant but your Buffs ARE NOT and NEVER WILL BE Nebraska's traditional rival. That honor goes to Oklahoma, Missouri and Kansas. Just check Hhistory. It's self explanatory.
Honestly, I don't think most Buffs fans give two poopies whether Nebraska views us as their "traditional rival". For the past 20 years, the NU/CU game has had significant implications more often than it hasn't, and both fanbases dislike eachother a great deal, so I think it's pretty safe to say that it's a rivalry game. Whether you view it as your "true" rivalry game, or however else you want to phrase it, is a fairly moot point. There's a rivalry between the two schools, it's a rivalry game.
Rivalry games are also fun. You might want to try enjoying it instead of throwing a fit over it.