I KIND OF get that. That's sort of my problem with a few black tomatoes. most "Blacks" and "Purples" are really dark pink or red with a green overlay or green patches. A few however, have the red and green completely integrated. This CAN result in a uniformly brown tomato (like "Mr. Brown or "Indishe Fliesch") which is fine, chocolate is brown and I eat that.
But in one or two cases the purple comes out the color of a bruise, and I find that REALLY off putting. The worst offender of that is good old Purple Calabash.
Then there is the green when ripe problem. I love green when ripe tomatoes (most of them, at least). But since most of them are really yellow green, they turn a horrific shade of olive khaki if you try and heat them (say, for tomato sauce). This year, I finally found some green cherries at the farmers market that seem to have no yellow component and saved seeds. But the problem then is that there is no way to tell if the tomatoes are ripe without touching them!