If you notice by reading CF or by going to a game you know that these people have a strange fascination with the color purple. They use the term "purple kansas" a lot, they are also fond of mentioning that you are wearing purple when you talk to them, I had this conversation no fewer than 4 times two weeks ago. I asked some locals here what's the deal with ISU fans and the color purple. As it turns out it actually stems from Northern Iowa butthurt

I'm not even joking. Could you imagine making fun of ISUs gold because of Wichita State butthurt? I would probably quit KSU out of embarrassment.
They didn't play UNI this season after UNI beat ISU 5 out of the last 6 years and that one ISU win was in OT

They have a legitimate rivalry with a Missouri Valley school

I guess hating the color purple makes plenty of sense for them.