Possibly you can extrapolate from a bad interview, but possibly you cannot. I vividly remember my S2’s interview at a school, with a professional AO where half the time (it seemed) she talked about how much she wanted to retire! Very bad impression!
My son ended up repeating 9th grade, so the next year he interviewed again at the same school. This time, he had the Dean of Admissions interview him, and it was amazing! And my son ended up attending, and it was a perfect fit for him, and the school totally changed his life.
So, a bad interview doesn’t always mean a school is like the interviewer.