This is blatantly false and the fact that your knowledge of a set of practices, representations, acceptable objectives, institutions, technical terms and even social practices at large DOES influence your "aesthetic taste" is the very reason why people like Dubuffet sought to get rid of all of those influences with art brut.
Yes I acknowledge most people now think everything, including taste, is hopelessly politicized; in fact I'm reading Bourdeau's La Disctinction which was a 80s sociology text composed of surveys exhibiting how taste in art is always closely connected to social class and background. But I, me, personally, believe that aesthetic standards can be derived separately from the sociopolitical a la Harold Bloom. For example many including Pissarro saw Gauguin's obsession with the primitive as merely an extension of bourgeois colonialism. But he also painted his Tahiti pictures in exile from European civilization let alone the art world (yes the Tahitians were somewhat westernized), and his channeling of purer modes of painting through savage imagery to become the symbolist painter extraordinaire made use of the bare minimum of theory, institutions, and influence of his contemporaries.