I am a human. My account is older than the time OpenAI decided to make ChatGPT available to the public.

After I wrote my last post, I remembered that the sentence «How many sets do you have left?» probably isn't just used as a form of small-talk among "bros", but in the context of gyms, where there is a limited amount of exercise machines, it is used as a way to ask when such a machine is going to be free again. Now it makes a lot more sense why the poster in the image said that and why the other people would react that way.