Don’t have time to check now, but believe kol kevudah is a hanhaga tova, but not a halacha. I think the gemara even applies it to non-Jews, and since non-Jewish women did not usually go out, there was no taynah on the bnos amon and moav why they did not greet the yidden with food and water, so as a result we have the halacha of amon vlo amonis. Please check before quoting me on this.
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