Is your chatbot less helpful because it thinks you’re a bad person? — Replicating a blogpost

TL;DR [1]A blogpost from a few months ago suggested that LLMs might provide less helpful answers if they see the user as a bad person. I replicate the experiment on more recent models: Opus 5.5, Sonnet 5.5, Haiku 5.5, GPT-6.1 Sol, GPT-6.1 Terra, and GPT-6 Luna. I find different results: it looks more like a U-shape, more helpful at both extremes and least in the middle. My main experiment involves using a different cue of the user being a good/bad person: I use descriptions of behaviours instead...