I don't think you should have been downvoted. Likely, people expected you to already understand the purpose of the question because I called it a variation of F

I don't think you should have been downvoted. Likely, people expected you to already understand the purpose of the question because I called it a variation of FizzBuzz - which is fair as it's quite well known, though maybe not worthy of downvotes. Those devs don't understand the reality of interviewing or take offense too easily. The reality is that people lie on their resumes, which makes such questions necessary. If they can pass, they can feel scoff all they want, but they had best answer the question or I will assume they are acting to avoid showing they can't answer it. It's an unfortunate waste of everyone's time.