Oh, the WORDS are there, but not the spirit. In the eyes of the Noble Isamic Gentlemen, if the other upon whom the good works are bestowed is not ALSO a Noble Islamic Gentleman, then the application is not necessary. There is an institutional blindness within the practice of this ideology, that only the favored ones are real humanity, the rest of the world who are NOT Islamic and male are inherently inferior, and no reciprocity need be extended to them.
The “golden rule” is meant to extend to ALL people, not just the favored ones. Else why would Islam condone the practice of holding dhimmi at the lower level of actual slaves, or demand the execution of the kafir, the unbelievers? This is certainly not the practice of any “golden rule”, as no Noble Islamic Gentleman would permit this equality before the eyes of his peers.
How can slavery coincide with the Golden Rule within Islam?
I guess about the same way the Golden Rule coincided with slavery in Buddhism, Hinduism, Christianity and Judaism for all of human history till the last two hundred years or so.
It is also a fact that orthodox Judaism prescribes very different standards of conduct from one Jew to another as compared to gentiles. Christianity is unusual in that its moral prescriptions are more or less universal.