In sermons or anywhere else, isms don’t work, as used by a preacher in commenting on Paul in Ephesians saying husbands be good to wives, masters be good to slaves etc.: don’t be sexist, racist, etc.
Rather, say do not act as if you own people (you don’t) — as the homilist also said — but as if (in fact they are) your neighbors. (Like our landlady who calls us her neighbors and acts the part.)
In general, racism, sexism, god-knows-what-isms are not helpful, have lost their meaning, involve social analysis which is arguable in ways that treating people kindly and respectfully is not.