"Some people?" I know of one person who vehemently declares that red tobaccos cause him problems, and he avoids them like the plague. There may be more people who feel the same way, but they are quiet. Just one person come to mind as repeatedly posting about reds. And, I don't blame him. If I thought that it was one type of Virginia that caused me pain, I'd do the same.
But, the differences in a red Virginia and a gold is just the temperature it was cured at. Reds are cured at 180F giving the sugars in the leaf more of a caramelized flavor, deeper, sweeter, more refined. And, usually the whole leaf doesn't turn red, and usually in a golden, parts have reached the same level of red caramelization. So, most flue cured goldens have edges and peaks in the leaf that have reached the same level of process as a red. So, it's hard for me to understand how any Virginia is 100% free of any red. But, to me reds are easier on my tongue, and capable of being smoked all day with better flavor and sweeter tones. Red Cake, Red Ribbon, and even latakias with reds are just smoother, whereas golds (and I still like golds) just seem more acrid and acidic and will cause a tad bit of exhaustion on my tongue if smoked repeatedly in a day.
C&D seems to use a mix of some sort of primitive flue curing, possibly sun curing that tears my mouth up. (Sure they have some reds, but they aren't as noteworthy as other blenders). And the taste, I don't have time to go into the quality or lack of... European Virginias seem to rely on flue curing and heavy casements and pressing to mellow out the Virginias. While McClelland has a variety of processes that really refine the flavors differently in each blend. (From yellow to reds to aged blacks) All of this from one seed stock, Virginia Gold. As far as Rattray's, I'm not sure how they process their Virginias, but they seem very similar to McClelland's aged blends. And, if they are pushing the VirginIa Golds to black, they are also processing it through the red stage. It would be foolish to think that a darkened Virginia hasn't passed through the red stage and is free of any hint of red coloring.
It's funny how one person can create a "belief" about a tobacco like this by repeatedly posting the same thing over and over. And, like I said, I don't blame him. But, I am just adding my voice to the ether on this. I think the reds are delicious and milder to the tongue, more refined and sweeter, IMO.