He "very literally said it," and then in the next sentence he said that middle class was $250k or less, thus giving a more precise answer. I think you're making a big deal out of 2 seconds of misspeaking.
Seems like a nonsensical way of making that point. I mean, the two statements (100k isn't middle class, and middle class is 250k and less) are contradictory, so the second can't be "a more precise answer".
I gather that you're saying that the intention was to say something like "No, 100k isn't middle class, because middle class is actually everything up to 250k, including 100k"? It's possible, but that just strikes me as an odd error of speech.
Either way, it's a gaffe, which is the entire reason that I linked it. And I do think that there's a reason that Romney's prone to such gaffes.
That, right there, was the sum of my point, which I've now beleaguered. Hardly "making a big deal out of it".