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Even if there is no chance the person being rebuked will listen, sometimes it is still necessary to take a stand. Even if the reproach will not be accepted, one’s words may have a long-term impact – if not on the sinner, then at least on others (who heard directly or indirectly about the confrontation). Therefore, if we see someone being cheated or humiliated, we must object even if we know the offender will pay no attention. However, after objecting, we do not need to say anything more. The Sages inform us (Yevamot 65b) that “Just as it is a mitzva to say something that will be accepted, so too it is a mitzva not to say something that will not be accepted.”
