First, CU fans aren't as bad as you're making out.
Second, CU fans are very few. Most of the people you see rooting for CU are students and Denver Broncos fans who don't really care about the Buffs.
Third, I doubt more than about a dozen CU fans would bother showing up to root against NU. They hate CSU almost as much as NU and they don't invade CSU's games.
Fourth, it makes good sense to play the game in a larger stadium since TONS of NU fans live in and around the front range and will probably go to the game, and Denver is only about 2 hours from Cheyenne.
Fifth, would you even go if the game was in Cheyenne? If not, then maybe you should shut up and stay home while the rest of us enjoy the game.
Sixth, using the word "dude" as a retort, automatically gets you a free ride on the short bus.