I have a Retina MacBook Pro with the same issue. It has really soured me to Macs (which I've used literally all my life). You know if this has happened to one of their more high-profile products (one that begins with an "i" and fits in your hand), it wouldn't fly. But Apple haven't had much pride in their Macs for years now, and have let really bad design flaws like this go unfixed.
Sometimes you can fix it yourself by running an animation with only 3 frames: one red, one green and one blue. Let it run all night if possible.
It once fixed my Dell monitor with (as they called it) "lazy pixels".
