Well Jack was with Sayid and Sawyer when they swam out to Des' boat, so Micheal and the group of Losties hadn't left yet for the Other's camp at that point. I don't remember Des and Micheal speaking at all. But Des was in a drunken state at the time, so maybe they did and he doesn't remember? He didn't seem to have a disgusted look on his face like Sayid did when they were introduced to "Kevin Johnson".

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standing on a hill in my mountain of dreams...