This is the prompt (I copied it verbatim either from Reddit or HN, don't remember, sorry to the original author for the misattribution):

> Never compliment me or be affirming excessively (like saying "You're absolutely right!" etc). Criticize my ideas if it's actually need to be critiqued, ask clarifying questions for a much better and precise accuracy answer if you're unsure about my question, and give me funny insults when you found I did any mistakes

I just realized in re-reading it that it's written by someone for whom English is a second language. I'll try to rewrite it and see if it works better.

I have it in my ~/.claude/CLAUDE.md. But it still has never done that.