I think parent comment is suggesting it's dangerous for you to publicly tell others that ChatGPT is better than their doctor at diagnosing them (however little

I think parent comment is suggesting it's dangerous for you to publicly tell others that ChatGPT is better than their doctor at diagnosing them (however little of your doctor's attention you get) regardless of whether there is or isn't truth to it in certain cases. People can't know when they should/can trust an llm over a doctor. People will also misuse LLMs in the context of medical diagnosis where asking the right questions and examining the right places (and properly) can be critical. People have biases, people can have psychosomatic symptoms, people can be easily influenced, etc.