I know that I followed a link to the post in question, and all I could think of after reading it was, "Oh, for heaven's sake. Don't these people have anything more important to get offended at?"

All I could figure was that the term "shack" in the original poster's regional/social dialect must carry with it a radically different assortment of connotations than it does in the dialect of speakers from other regions/social groups . . . and that was before the First Nations came into the argument from somewhere out in left field.