In the U.S., same-sex and interracial couples benefit from federal court decisions recognizing and protecting their marital unions. Despite these legal protections, prejudiced beliefs and subtly-biased behavior toward these groups may still be socially normative. The present studies surveyed Americans’ beliefs about the acceptability of prejudice toward same-sex, interracial, and white heterosexual couples and then examined actual behavior among wedding venue professionals towards them. In Study 1, Americans felt it more socially normative to express prejudice toward same-sex couples than toward interracial couples and heterosexual couples; they also forecasted that same-sex couples would experience more discrimination by wedding industry professionals than interracial couples. Study 2 used experimental audit methods to examine whether the actual behavior of wedding venue professionals aligned with Americans’ social norm beliefs. Results revealed that same-sex couples and, to a lesser extent, interracial couples experienced more discrimination by wedding industry professionals than did white heterosexual couples.