Every major framework for evaluating health AI concerns — from institutional review to the patient-centered literature — is organized around whether the tool is accurate, whether it protects privacy, and whether it reaches underserved populations. What the r/autism thread exposes is a fourth axis that none of those frameworks captures: whether the tool's language, when processed literally, produces harm in users whose cognitive architecture makes literal processing the default, not a failure mode . The phrase 'do your best' is a motivational prompt to its designers; it is a prohibition…