>>661368
They presuppose anyone who believes what they don't is stupid, ironically because they're stupid. It's like contesting "But the bible says God doesn't exist. Bet you didn't know that." I'm pretty sure all atheists commit this fallacy, whatever it would be called.
For example, I posed this argument to an atheist friend of mine:
1. If propositions are abstract objects, they are not contingent.
2. Propositions are contingent
3. Therefore, propositions are not abstract objects. (modus tollens from 1)
4. If it's true and doesn't have meaning, it's an abstract object.
5. Propositions are not true or they have meaning. (modus tollens from 4 and 3, DeMorgan's Law)
6. Meaning can be necessarily subjective and yet objective only if it's subject to God.
7. Meaning is necessarily subjective, i.e. meaning doesn't exist unless it can have meaning to someone, e.g. a book would have no meaning or potential meaning were no one ever to exist to have written or understand it; it would just be scribbles.
8. Therefore, if God doesn't exist, objective meaning doesn't exist. (modus ponens from 6)
9. If the proposition "Objective meaning doesn't exist," is false, objective meaning exists.
10. If objective meaning doesn't exist, the proposition "Objective meaning doesn't exist," doesn't objectively have meaning.
11. If a proposition is true, it has meaning. (disjunctive from 5)
12. If it exists, it objectively exists, e.g. if an idea exists, it objectively exists, not necessarily the subject of the idea.
13. The proposition having meaning, exists.
14. Therefore, if the proposition having meaning, exists, i.e. "if the proposition has meaning," then it having meaning objectively exists, i.e. "it objectively has meaning." (modus ponens from 12)
15. Therefore, if the proposition is true, it objectively has meaning. (modus ponens from 11)
16. Therefore, the proposition is self-refuting. (modus tollens from 10)
17. Therefore, objective meaning exists. (modus ponens from 9)
18. Therefore, God exists. (modus tollens from 8)
The only valid contention would be if objectively having meaning is the same thing as having objective meaning, and yet he proceeded to claim it commits like a dozen fallacies, demonstrating not only a profound misunderstanding of what he was saying, but also the presupposition that I am stupid enough to pose an argument that somehow commits a dozen fallacies.
They just presuppose we're retarded. It has to be some kind of Presupposition of Stupidity of Your Opponent Fallacy or something.