Well for me, personally, blue and green are simply not adjacent, so there's no point where green turns to blue without going through an intermediate color. This might well be due to my extreme exposure to computer colors, where the in-between color is usually called cyan, or sometimes teal or aqua. When I see cyan, I cannot sincerely say that it looks “more blue” or “more green” to me, any more than an orange tastes “more apple” or “more banana”.
Light can absolutely be more blue or more green in an objective sense. Either it is closer to blue on the spectrum or it's closer to green. It doesn't matter if you have intermediate categories in between.
To poke a whole in your analogy, a more apt comparison would be to a gradient of sweetness, where one can indeed describe a flavor as "more sweet" or "less sweet" relative to apples and bananas.
The whole point of the test on this website is to judge subjective color perception, so I'm gonna go out on a limb and say you missed the point of my comment.
I suspect that if you were shown two blue-green colors side by side, with nothing between them, you could look at the boundary and tell which side contains more blue.
