The Gathas never indulge in details of what one must do and must not do in a society. The Gathas do not interfere into the details of one's daily life. They do not make life cumbersome by breathing down one's neck. The divinely enlightened Zarathushtra knew well that society and civilization do not remain long unchanged. They are continuously changing with the passing time.
Social differences are evident from time to time and place to place.
Any instruction on daily life would grow old, or be out of place in another location, and if it becomes a tradition to be adhered to, it would only prove an obstruction in a changing and progressing world. That does not mean that the Gathas advocate abandoning or discarding any good, logical and useful tradition. What they disown is obsolete, retarding, useless, dumb, unintelligible, and superstitious customs. A universal message cannot force the traditions of one society upon another's. A universal message ought to be above regional and temporal differences.