Yep, they exist. I'm one of them. When you see either red or green in isolation, does it take you longer than usual to tell which it is? It does for me. It's p

Yep, they exist. I'm one of them. When you see either red or green in isolation, does it take you longer than usual to tell which it is? It does for me. It's pretty rare that I simply can't tell at all, but it does happen, and it's common that it takes me multiple seconds to figure out which it is. The little red/green leds that the sibling comment mentioned can indeed be particularly shit. The purple thing sounds familiar to me. If you take blue and add red or green, it can be very difficult for me to tell which it is. That was my earliest issue with colors, I got in trouble in school for mixing up bluegreen and purple. There do exist some pretty detailed tests for exactly which type of colorblindness you have if you're curious, though I'm not sure if they can be done reliably on a non-calibrated monitor.