I am so sorry you had this terrible experience and agree that this had nothing to do with you at all and it sounds like you were a real champ in handling this unpleasant surprise interview. No they do not try to do trick interviews. If you read through the pinned thread at the top about interviews with Brown alum, you will see they are overall positive with some awful ones that pop up from time to time. I agree this is reportable. fireandrain is a long time Brown interviewer and I’d listen to her and report it. Brown certainly would not want this alum to represent them in interviews any longer and it won’t change unless they hear about it. Sometimes you can get offered another interview and they will surely set this one aside. Report it after results if you feel more comfortable. My own daughter had a wonderful chat with her alum, a french professor at a local college, who was so complimentary. A girl this year I know had a less that ideal situation, multiple interviewers with schedules of students coming through every 15 minutes, ug. But the man was very sweet and kind to her and said she will be a wonderful addition to any campus.
There is a very funny old thread of interview horror stories and maybe when some time passes you can think of this in a funny way and add on. Some of these were terrible at the time and the kids are laughing later. I’ll see if I can find it. Meanwhile, if you want to know anything about Brown, ask away.