Here's what's wrong with your comment:
What, in the world, makes you think that EIU fans would be any less ugly about a similar situation at ISU whether or not we were taunting them over the current issue?
You have got to learn that no matter how civil you try to be with an EIU fan, that he/she will NEVER return the favor. In fact, you could even reach out and try to make a comment about this problem happening at other institutions and the EIU fan would turn it around and find some way to insult you and ISU.
I could care less about the situation at EIU. Plus, I would rather take the "high road" and decline taunting. But, you absolutely cannot base your decision on the idea that you are somehow avoiding future "ugly" behavior by EIU fans. Really, put that idea completely out of your head right now and simply expect that EIU fans will find every possible way to insult you at every possible opportunity. It's just who they are.