> I can consistently reproduce this by asking Claude which code snippet it prefers: the one it generated in a different chat, or one that I refactored for my own needs and find more useful. It always picks its own :)

A better question to ask for each snippet is "Estimate the seniority and competence of the developer who wrote the following code, ignoring bugs that linters or LLMs can catch and focus only on structure, maintainability, logical layout and readability."

It almost always estimates the author of my code as above the author of it's own code.