Every conversation requires good-faith, charitable interpretation of what others are saying. I don't know how to interpret your remark, in its original context, as good faith. I said nothing that could reasonably be interpreted as requiring that native speakers "not go shopping". If you were actually interested in a meaningful exchange of ideas, you would have given a more substantive reply than that one.

I agree that if you're not going to take the discussion seriously, you probably shouldn't join it -- it just makes HN worse. Strawman argumentation doesn't suddenly become okay just because "hey man, we were just discussing grammar and its colloquial use", as if it's somehow okay to deliberately misinterpret someone and waste their time in that case.