Social psychologist William McGuire suggests that when an audience agrees with you about a persuasive issue, you should inoculate them by increasing their resistance to counterpersuasion. You can do this by

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McGuire suggests that increasing the audience's resistance to counterpersuasion is helpful in preventing attitude change. Thus, building up audience resistance to counterpersuasion by showing them how to refute opposing arguments is the best approach. Giving more reasons to support the shared position or attacking the opposition's credibility may be effective in some cases but are not specific to McGuire's inoculation theory. Making jokes or using demeaning slogans may be counterproductive and could activate reactance, leading to further resistance to persuasion.

Social Psychologist William McGuire Suggests That When an Audience Agrees