I recently gave 2 interviews for my McK first round, on different days (Industry hire - Operations practice - Singapore Office). My first interview went really well and I connected with the interviewer. During my second interview, the interviewer was a young guy (I later learned from a colleague that I was probably his first interviewee) and he was very off-script during the interview. Initially I thought he was just being casual to throw me off but he kept mocking my answers/recommendations and refused to give me time to prepare for any questions.

I have been notified now by the recruiter that I need to give a third interview to balance out the recommendations, which is what I expected. Another EM in McK has encouraged me to feedback to the recruiter about this experience but I am a bit hesitant since I might be directly working with this person, if I get an offer. How should a candidate handle such experiences?