Many years ago Mr. Show had a sketch in which they were desperately trying to get hate mail. So they were making really offensive racial comments and singing songs about them in order to get that much-needed hate mail. The point of the sketch was to think of the most horribly offensive things they could say and to run with them. So it opened with them having a discussion about the horrors of African slavery, which segued into the fact that Abe Lincoln was responsible for the emancipation of African slaves in America, to which they added "So to our African American friends, we say...you're welcome!"
Now, in this context, it was obvious they didn't actually believe that, and indeed found it greatly offensive to suggest such things. The whole point was that comments like that are so offensive they would guarantee them (rightly) getting hate mail.
But now Pat Buchanan has said the exact same thing, except he's serious. Instead of a joking ploy to get hate mail, he just actually believes that African Americans should be thankful for all that white people have done for them, save possibly that awkward 400-year period where we were kind of still feeling out how our relationship was going to work.
In fact, he doesn't just say that they should be grateful, he says that "no people anywhere has done more to lift up blacks than white Americans." You know, except for the 4 centuries of slavery, the century of legally-enforced apartheid, and the continuing racial disparities in all major health, education, income, wealth, and well-being measures. Other than that, yeah, white people have been pretty good to blacks.
You know, it's getting really hard to make good ironic sarcasm these days when conservatives are literally repeating old comedy sketches about the most offensive statements possible as if they were intelligent insights...