Some theorists and critics insist that no aesthetic evaluation of a work of art is sound if it is based even in part on data about the cultural background of the artist. This opinion is clearly false. The only sound aesthetic evaluations of artists' works are those that take into account factors such as the era and the place of the artists' births, their upbringing and education, and the values of their societies-in sum, those factors that are part of their cultural background.
The above argument is most vulnerable to which of the following objections?