MsProud's recollection of what happened is entirely accurate. I was at the game. The official fell down, and the crowd laughed and cheered. Kelvin took the mic and semi-scolded the fans for the behavior and then made the comment about refraining from chanting Muoneke sucks, Texas sucks, etc.
And quite honestly, I'm not sure why it was that big of a deal. I'm very surprised it's still a topic of discussion 15 years later. I'd rather talk about how much Kelvin's teams owned Texas instead of what he said about the crowd!
It was a naive request by a young coach early in his career at OU. But it was meant with good intensions, and there was a semi-embarrassing event (the crowd laughing at an injured official) that triggered his comments.