From the day we could comprehend what others were saying, we were learning. People teach by how they understand things to be. Therefore, you are always taught, especially before you could think to question, the ideas and veiwpoints of the teacher. However, in reference to color, how can one be sure that person A's blue does in fact look the same as person B's. I make no statement that this idea is false, nor do I intend to try to disprove it. However, what if it were false.
People all have different colored irises in the eye. When that is taken into account, one can begin to imagine that, when one person sees what you know as red, the other may see what you know as blue. Of course to them, it would be called the same color because they learned, whatever that color is percieved as, is the color name. So someone looks at the 'blue' sky, one may see green, one may see red, but they will both call it blue.
I know this may be hard to understand, perhaps because the wording is confusing. However, if this theorem is correct, it would really explain the difference in 'favorite colors'. Also, the same could be applied to tastes, with 'favorite foods'. Perhaps we all like the same things, it is our perspective that is different.
