RenhetI don't think it's something to pity. Ellie_Goulding said it doesn't bother them, and many people live normal lives with it. They might do things differently and have warranted complaints about TF2's colorblind mode, but yeah. Monochromatic Bunny said it something like, he doesn't know any different, so what is there to miss?
This is mostly true. I don't even think about it other than when playing games that require me to see certain things. I would not have made a fantastic warrior in WW2... I can't tell blue from gray in most cases.
There are a few instances in real life where it is a huge issue...namely electrical wires and traffic lights. Orange and red lights are impossible to tell apart, and green isn't far behind. If all traffic lights were the same, it'd be easy enough, but there are many times where I have to just assume it's red and go by the traffic surrounding me. I do get honked at frequently in smaller cities when people can't go around me when I stop at greens... :|
Moose was telling me about some new lights that are just one light that changes colors instead of 3 separate lights. Whoever designed that is an idiot and I hope they don't become mainstream.
In TF2, I primarily just look at what someone's doing to determine whether they're friendly or not. If playing demo, I detonate traps on teammates waaaay too much. There are certain hat effects that make it virtually impossible for me to tell whether a person is a teammate or not and other effects seem to make people essentially invisible to me. It's bizarre, and it's just an effect caused by the hat stealing my focus, but it's unavoidable and reeeeeeeallllllly annoying.