To expound on Wicked's explanation, you can learn to use it to your advantage or add a bit of the color you are spraying over to the white to fool the eye into not seeing the blue shift.
That's sorta hard to do over black paint though. I've seen people do a light dusting of white over the whole surface so that you don't have the shift in just certain areas. If it's uniform over the entire surface your mind doesn't "see" it. If it's only in a spot or two then you eye will pick up on it and it'll be something that looks "out of whack" in your painting.
I try to preserve the blacks in a painting (if I'm painting over black) and try not to use white over sprayed black if I can help it. Vice versa with black, sometimes you'll get that nasty brownish shift when spraying black over white.
It's learning how to use a particular colors quirks to your advantage.