I would recommend that you take no action against the interviewer, considering that the interview itself means very little. Anything you do brings only attentions to yourself, not to your application. My DD was criticized for every school she applied during one of the interviews by HYPSM in a similar way that you were treated. She was crying in the middle of the interview and did not stop until two hours after she came home. In the end, it didn’t matter. She got in, but decided that she did not want to go to that college anymore because of the terrible interview experience.