It also makes the assumption that I will vouch for every cheer/chant that Purdue does just because I'm a Purdue fan. I certainly don't. I think the "IU Sucks" thing is stupid, juvenile, and does exactly the thing that IU fans say it does, prove that many of our fans are pre-occupied with them. I've argued with many people on this site, mostly on KHC, who claim it is just "fun". Clearly, those people have a lower standard for fun than I do.
Having said that, most of the drivel that I've heard IU fans accuse Purdue fans of doing/saying is unsubstantiated and, while some of those unsubstantiated accusations could be real, they are usually focused on a few individuals that they claim to have observed personally. I have no doubt we have some jackasses in our fan base that are capable of representing us poorly. Every fan base does.
There's a big difference between unsubstantiated accusations focused on a few individuals (which should also be dealt with if proven true) and mass chants by thousands that can be clearly deciphered by everyone in attendance or watching on TV. IU can choose to deal with it or not, and their fans can choose to defend it or not. But there's no argument as to what actually happened. Fortunately, some IU fans are actually embarrassed by it.