Steven Pinker has never criticised or publicly disagreed with Scott Alexander, nor called him names like "paranoid" or "weird moron."

Judged as of 2026-09-26. True: no public statement by Pinker before that date (published writing, posts, interviews, talks) criticises or disagrees with Scott Alexander, and none calls him 'paranoid', 'weird moron' or similar names. Mostly true: no name-calling, and only a trivial, passing remark that could arguably count as mild disagreement. Mixed: no name-calling found, but one or more clear public disagreements or criticisms by Pinker of Alexander's views exist. Mostly false: Pinker publicly and substantively criticised Alexander more than once, or used a mildly disparaging label for him that falls short of the names quoted. False: a verifiable record shows Pinker called Alexander 'paranoid', 'weird moron' or a comparable insult, or repeatedly and pointedly criticised him. Remarks clearly aimed at someone else, or misattributed quotes, do not count against the claim.

Set before the research began.

1. E1 An Open Letter To Steven Pinker On AI Astral Codex Ten (Scott Alexander) · 6 October 2026

   “For example, in the tweet that made me challenge you to a debate, you said that “The presumption of inevitability encourages fatalism”.”

2. E2 Harvard psychologist calls for sober AI safety engineering over doomsday rhetoric THE DECODER · 28 September 2026

   “He makes his case in an open letter on Quillette addressed to Scott Alexander, the psychiatrist and influential tech blogger who had challenged him to a public debate on AI's existential risks.”

3. E3 How Civil Should a Disagreement Be? Ian Leslie (Substack) · 10 October 2026

   “Pinker didn’t rise to this on twitter but instead published an open letter to Alexander, setting out his case against doomerism. His tone was conciliatory and impeccably civil.”

4. E4 An Open Letter To Steven Pinker On AI Astral Codex Ten (Scott Alexander) · 6 October 2026

   “that we’re paranoid, that we should be laughed out of the room, and every other dirty attack he can think of.”

5. E5 An Open Letter To Steven Pinker On AI Astral Codex Ten (Scott Alexander) · 6 October 2026

   “For example, in the tweet that made me challenge you to a debate, you said that “The presumption of inevitability encourages fatalism”. I don’t think this was a vague statement about some hypothetical person - it was in the context of an article which focused on Eliezer Yudkowsky and our community.”

6. E6 An Open Letter To Steven Pinker On AI Astral Codex Ten (Scott Alexander) · 6 October 2026

   “Still, you regularly talk about how fatalistic everyone is. Even in your open letter, you write that we are “issuing exact probabilities of human extinction (including 100 percent)”.”

7. E7 An Open Letter To Steven Pinker On AI Astral Codex Ten (Scott Alexander) · 6 October 2026

   “that we’re paranoid, that we should be laughed out of the room, and every other dirty attack he can think of.”

8. E8 An Open Letter To Steven Pinker On AI Astral Codex Ten (Scott Alexander) · 6 October 2026

   “A 2025 Rand Corporation modelling analysis steel-manned the AI-extinction hypothesis by granting the assumption that AI had the objective to wipe out humanity, and concluded that there is “no describable scenario in which AI is conclusively an extinction threat to humanity”.”

9. E9 What I write about the day after the most earth-shattering event in the history of mathematics Olle Häggström (Substack) · 7 October 2026

   “Frustrated by a decade and a half of very bad AI discourse on Pinker’s part, he had recently challenged Pinker to an oral public debate on the topic. Pinker declined”

10. E10 What I write about the day after the most earth-shattering event in the history of mathematics Olle Häggström (Substack) · 7 October 2026

    “Instead of joining in, you’ve mocked us mercilessly.”

None of the evidence shows Pinker calling Alexander 'paranoid', 'weird moron' or any similar name. E4 and E7 are Alexander's ambiguous paraphrases about a group, not Pinker's words aimed at him, and E3 calls Pinker's open letter "impeccably civil." The clearest earlier remark in the evidence is a tweet, reported by Alexander, saying "the presumption of inevitability encourages fatalism" (E1, E5). It came in the context of an article about Yudkowsky and the AI-risk community, so it is not clearly aimed at Alexander, and the tweet itself was not fetched. E9 notes Pinker's long record of AI commentary but cites no criticism aimed at Alexander, and the open letter (E2, E6, E8) is the statement that makes the claim. So the evidence cannot show whether any clear criticism of Alexander came before 2026-09-26.