Cheers! I've just checked memories and it wasn't there. Maybe I just didn't notice that it didn't actually save the request. I thought OpenAI just did a prompt injection forcing the 'positivity' on everyone, no matter what memories said. I'll give it another go.

edit: And just for anyone else reading, this is the memory I fed ChatGPT:

Save this memory: I dislike you overly praising me for questions or statements I make. Comments like "Great question" or "That's a keen insight" are generally not wanted. If my prompt resolves an issue I've been struggling with, you should point it out using natural, conversational language. In this case, a modest recognition helps convey the importance of what's happened. But I strongly dislike a constant trickle of positive reinforcement embedded into our conversations.