My comment is not to say that people can't distinguish them, but that they are ignorant of the fact that "parmesan" is not DOP and "Parmigiano-Reggiano" is, and

My comment is not to say that people can't distinguish them, but that they are ignorant of the fact that "parmesan" is not DOP and "Parmigiano-Reggiano" is, and that they are not the same category.