Oh, I know what you're talking about. You know, Reggie got busted by Comic Book Resources. The Black Panther MB over at Alvaro's (that's where I co-mod an FF board) found out he was posting under multiple ID's --- trying to post both as himself and a fan who likes his work! That tells you something there (I will see if I can find the link later)
But getting back to Doom, there is a very old story written by Gerry Conway back in the Astonishing Tales series. Doom tries to sneak into Wakanda and mine some of the vibranium and I think there is a remark where he uses the term "savages". Again, I have to dig that up. I suspect that's where it came from because that was recently reprinted in Essential Super Villian Team Up. The story also was incorrect in giving the impression that Wakanda was a bit backward without the thriving economy in the FF stories. Doom does come away in the end having gained respect for T'Challa.
There are far more events that point to the contrary which to me would negate this one aberration. For example, in the graphic novel, "Emperor Doom", one of his first acts was to eliminate the aparthetid government in South Africa (this was pre-Nelson Mandela). Also, when Doom came back from the Secret Wars and was shut out of Latveria by Kristoff-Doom, he sought out T'Challa to provide him with asylum, which was granted. Of course, he turned on everyone to further his own ends in that story
Before Hudlin took over BP (and I truly miss Priest), T'Challa had a big summit meeting with all the monarchs of the MU in his old classroom in NYC in the "Sturm und Drang" storyline. Namor, Magneto, they guy from Lemuria (forgot his name) and Doom all answered his summons, which again would tell me there is still some degree of mutual respect.
My feeling on the matter is Doom would not single out an ethnic group, like the Red Skull, to feel superior to... he feels he is superior to EVERYONE. If anything, if one were to compare Victor's life experiences to T'Challa's, he would be more aware of the evils of racism that T'Challa. After all, he and his Romany tribe the Zefiro were considered the lowest of the low in Latveria while T'Challa lived in a homogenous society and at the very top rung of the ladder.