Thanks to Pam for pointing out the audio file of a sermon Herb Armstrong gave - probably in the last year of his life - on interracial marriage. It is, simply, horrendous, salted with threats of the Lake of Fire. Includes appreciative clapping from the mindless sycophants in the congregation. It fairly drips with racist rhetoric. God destroyed Noah's world because only he and his family were racially pure and, therefore, worthy of saving ("Noah was perfect in his generations"). He was the only man left who was "pure white". Segregation is good ("God's way is geographical [yells]segregation! And integration is not the way of the Eternal God!"). The Canaanites were black.
As usual for Herb's sermons, he rambles all over the place (Adam, two trees, give/get...) before getting to the point, but the point - when the old goat finally gets to it - is painfully clear.
The audio (a little scratchy) is available here. It lasts just under 69 minutes.