Basically, he is disparaging patriotic Americans by calling them names, because they do not share his social & cultural prejudices, but seems too dense to even understand what he is doing.
If the balance of the article magically corrects all these flaws, I apologize; but based upon many decades of experience debating people who fall into these precise fallacies, I really doubt it. Your sample was quite long enough to offer repeated examples of my points.
It is entirely probable that the founding fathers believed their black servants were less intelligent and less industrious than themselves. It’s possible that they were. But that belief was not what made them patriotic, or made America great. It was incidental, not central or the cause for their greatness.
DeTocqueville hit it on the head when he said that slavery dishonors labor, and was thus a hindrance to the progress of the South. He asserts that the educated middle class merchants and artisans who colonized New England were the ones who put the ferment in motion, because they considered religion to be necessary for liberty, and because they had no aristocratic class, and because they believed in hard work. Whatever the original Yankees believed about blacks and their natures was immaterial.
It seems from your original response that patriotism is another word for believing blacks are lazy and stupid, or that believing blacks are lazy and stupid is patriotic. Perhaps you spoke imprecisely, and perhaps you didn’t read the article and therefore mistook its meaning and wrote something not responsive to the actual substance of the article, such as it was. That was what I thought. Please clarify your meaning.