This probably isn’t a hallucination in the classic sense.
This is probably a near copy of a forum post where a user was channeling fight club and trying to be funny. The same as the putting glue on pizza thing.
And guardrails don’t work very well. They’re good at detection tone but much worse at detection content. So an appropriately guardrailed LLM will never call someone a “fucking ######” but it’ll keep telling everyone that segalis have an IQ of 40 until there’s such a PR backlash that an updated is needed.
https://www.sciencedirect.com/science/article/pii/S2210261224009209