Not at all. People who treat some things as infinitely worse than others don't do so because they believe that a list that includes both somehow stops being a list, and the threat starter never implied anything in that direction. They just have inconsistent preferences (at least in the sense of being money-pumpable). Either that or they bite the bullet and admit that there is at least one particular item infinitely worse than the preceding for any such list. Denying that a list is a list is just nonsense.
We are in violent agreement (but I'm coming off worse!).
rstarkov suggested that people may have "utility functions" that don't take real values.
Endoself's comment "showed" that this cannot be, starting from the assumption that everybody has a preference system that can be encoded as a real-valued utility function. This is nonsense.
My non-disagreement with you seems to have stemmed from me not wanting to be the first person to say "order-type", and us making different assumptions about how various poster's positions projected onto our own internal models of "lists" (whatever they were).
In general, the ethical theory that prevails here on Less Wrong is preference utilitarianism. The fundamental idea is that the correct moral action is the one that satisfies the strongest preferences of the most people. Preferences are discussed with units such as fun, pain, death, torture, etc. One of the biggest dilemmas posed on this site is the Torture vs. Dust Specks problem. I should say, up front, that I would go with dust specks, for some of the reasons I mentioned here. I mention this because it may be biasing my judgments about my question here.
I had a thought recently about another aspect of Torture vs. Dust Specks, and wanted to submit it to some Less Wrong Discussion. Namely, do other people's moral intuitions constitute a preference that we should factor into a utilitarian calculation? I would predict, based on human nature, that a if the 3^^^3 people were asked if they wanted to inflict a dust speck in each one of their eyes, in exchange for not torturing another individual for 50 years, they would probably vote for dust specks.
Should we assign weight to other people's moral intuitions, and how much weight should it have?