Mimicry of the condescending interviewer included actions such as leg-crossing and chin-touching, says Piotr Winkielman, a professor of psychology at UC-San Diego. These actions are relatively innocuous, but observers can see from them that the person interviewed is adapting the same body language as the condescending interviewer.
Meanwhile, participants were asked to rate the trustworthiness, competence and likeability of the people being interviewed. Researchers found that actors who mimicked behaviors such as leg-crossing and chin-touching had lower ratings, meaning participants didn't take as great of a liking to their tactics.
The same can't be said for conditions in which the participants were shown videos of job interviews in which the actor did not mimic the interviewer.
To look at whether body behavior or language was linked to this trend, researchers conducted the same experiment, but cropped the person being interviewed out of the frame, leaving participants exposed to the person's audio alone. They found that mimicking the condescending interviewer didn't negatively affect participants' ratings of that person when the person wasn't visible.