For the source text click/tap here: Kiddushin 28
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The Gemara asks: the court ostracizes one who says this to another, as it is taught in a baraita:
One who calls another a slave shall be ostracized. One who calls another a mamzer incurs the punishment of forty lashes. If one calls another a wicked person then the insulted person may harass him in all aspects of his life.
In light of this halakha, it is clear that the court will not force the accused to respond to this insult by taking an oath.
We explore insults in the talmud and in antiquity.