My question was somewhat rhetorical, in response to your "Why the broad reluctance..."
In fact I read through the thread that you link to and found it quite unpersuasive.
It's true it's somewhat surprising that so many people said they preferred the taste of milkshake. But in reality that's partly a question of context. If you're comparing the taste of sweet things with the taste of non-sweet things, it can depend on what you feel like at the moment. Sometimes you have a desire for sugar, sometimes you don't.
Did you read it all? It wasn't just the milkshake comparison. It was the fact that, if you ignore the question "do you like alcohol?" and simply ask about the supposed implications of liking alcohol, my answers match up with everyone who claimed to like alcohol. Yet I characterize my state as "not liking alcohol", while others characterize it as the reverse.
See the checklist.
Again, the point is to subtract away the influence of factors that can make you like anything. If applejuice made me happy and killed my usual inhibitions, I'd ...
Today I looked at the above illusion and thought, "Why do I keep thinking A and B are different colors? Obviously, something is wrong with how I am thinking about colors." I am being stupid when my I look at this illusion and I interpret the data in such a way to determine distinct colors. My expectations of reality and the information being transmitted and received are not lining up. If they were, the illusion wouldn't be an illusion.
The number 2 is prime; the number 6 is not. What about the number 1? Prime is defined as a natural number with exactly two divisors. 1 is an illusionary prime if you use a poor definition such as, "Prime is a number that is only divisible by itself and 1." Building on these bad assumptions could result in all sorts of weird results much like dividing by 0 can make it look like 2 = 1. What a tricky illusion!
An optical illusion is only bizarre if you are making a bad assumption about how your visual system is supposed to be working. It is a flaw in the Map, not the Territory. I should stop thinking that the visual system is reporting RGB style colors. It isn't. And, now that I know this, I am suddenly curious about what it is reporting. I have dropped a bad belief and am looking for a replacement. In this case, my visual system is distinguishing between something else entirely. Now that I have the right answer, this optical illusion should become as uninteresting as questioning whether 1 is prime. It should stop being weird, bizarre, and incredible. It merely highlights an obvious reality.
Addendum: This post was edited to fix a few problems and errors. If you are at all interested in more details behind the illusion presented here, there are a handful of excellent comments below.