פירוש על עבודה זרה 128:4

The baraita says that only a non-Jew can annul an idol, but that he can annul idols belonging to his fellow and it also says that he can do so whether he worships it or not. These two phrases cannot be synonymous for if they are, the baraita would seem to be repetitive. Therefore, the Talmud interprets the phrase “he does not worship it” to refer to a ger toshav, who, it seems, can annul an idol.