Why are you doing replacements at the apple store? Order from the online store. Put it on a credit card. Keep returning till you get one you like. May take a while. I went through 4 phones like this (2 in store). It's much easier to do it online. No one questions you. You just click a button, print out a label, select a pick up date, and leave the thing in your 'safe place' to be picked up. You don't even have to talk to anyone. Apple refunds you within a week. You can also order 2 at a time if you do it this way. That will speed up the time it takes to find one that satisfies you.
As far as I can tell, most people can't see these problems that we see. If they could, lots of people would be complaining, and this would have gotten some major press coverage. I suspect there is some small percentage of the population who have more sensitive color receptors in their eyes or something. It is true that there are variations between people in color sensitivity. There are even some people with an extra cone type who can see colors no one else can. I suspect we are people with usual eyes that are more sensitive to color differences than most people. For example, my wife claims she can't see the issues I see with screens in general. She could not see the yellow at the bottom of the iphone screens I was returning and thought I was being OCD.
It's hard for people with different eyes to understand how it looks to us.