The colors of visible light form a continuous spectrum. "Red" vs. "blue" is a meaningless criterion devoid of all content which invites arbitrary judgement.
That's not a good comparison. Red and blue have very objective definitions given that we have three types of light receptors in our eyes, and a given kind of light can be measured to activate the "blue" or "red" kind without any subjective input.
It is sometimes speculated that Homer wrote about "wine-red seas" because the ancient Greeks considered blue and red "the same" color. Or, to take a more modern example, the Japanese consider blue and green the same color (there are words that can distinguish, of course, but we have words that can distinguish various shades of the same color too). Clearly the division into different colors involves some degree of subjectivity and yet it doesn't make sense to claim that, therefore, words for colors are meaningless.
