One instance I was picking up some groceries and there was an Arizona fan (I believe) in front of me buying some stuff. The store clerk made some comment about how he hopes their star player gets injured during the game.
At a bar in Bend last fall there were some beaver fans with all their orange and black watching a UO game. A big group of UO fans were talking trash the whole game and any good play by the ducks, they would all turn around and sing the fight song. Enough to where I said to hell with the game and left cause it was so annoying.
Also lived in the bad parts of Eugene, lots of theft and crummy stuff.
That being said, I know not all duck fans are a-holes, the rest of my family graduated from there. Good luck, and good cooking.