Their most vulgar invectives are often aimed at women, particularly those seen as enemies of Mr. Trump. In one video, the former United Nations ambassador Nikki Haley’s face is pasted on the body of a nearly naked woman, who kicks a man with the face of Gov. Ron DeSantis of Florida in the groin. Another depicts Casey DeSantis, the governor’s wife, as a porn star. Women with ties to Mr. DeSantis are often shown with red knees, suggesting they have performed a sex act.