This “ignorant blanket statement” may well be the truth, which I believe is a good defense against charges of racism. I suspect that the percentage is a good deal higher in the inner cities of this country.
I have no doubt that a great many black Americans know a lot more about geography than I do. I also have no doubt that a great many know nothing and have no intention of ever learning. Anyone who thinks that is a racist statement does not understand the concept of racism.
Whether it is the truth or not isn't the point, and I fail to see how it serves the Conservative cause to make such a statement. As far as me having no knowledge of what racism is, you have no idea of who you are talking to or what you are talking about. Best to keep your false assumptions to yourself, lest you be made a fool.