It was 7 years ago and in the time since, I got married (all sorts of things I have to keep track of now) and have had a lot of beer along the way, but this is what I recall.
In his live postgame show he was lamenting the loss to the whitest and slowest team in America, Iowa. The next day on his show (or continuing since his postgame show) Hawkeye fans were calling him racist, contacting his sponsors, and I believe attempting to get his wife fired from her job. I think he lost some of his sponsors temporarily and some completely. I don't think all those details were disclosed. Someone, closer to Brandon probably knows.
In my head it was a few weeks or months later, in the betting section of the show, he got into heated debates with Iowa fans and self-appointed College Football gurus. It circulated in the sports gambling space and Portnoy caught wind of it. He had Brandon on one of his shows and then invited him to NY, I think with the original intent to seize the moment of publicity and to make fun of this "rustic" rube from provincial Mississippi.
Brandon turned it into an opportunity of a lifetime, seizing the moment himself; and it all started with Morehead's inexplicable bowl loss and Iowa fans.
@dawgstudent feel free to correct any and all of this, but it's how I remember it.