How about, "this particular cat 5 race I was in was a joke. However, I don't really know if there are other cat 5 races that are more competive. Because I am a 5 I really don't know much about racing anyway."

I have witnessed 5 races that were the same length as the 3-4 and just as fast, without accidents. It's all for kicks and giggles anyway. Don't take it too seriously. Over in Europe kids race farther and faster than you.