I had something similar. I was given an extensive exam to take before the interview, and it consisted of weird things like 200 arithmetic problems in 15 minutes, picking the best synonym for 100 words in 5 minutes, etc. Things not humanly possible without immense preparation for that precise test.
The interviewer comes in and starts berating me for not finishing and how I must’ve gone to a bad school, must not be smart, etc. Then he goes on and on about how I’m clearly not suited for the job and his young assistant is sitting beside him laughing.
It was a crazy interview. I mentally gave up after a few minutes because the guy was clearly fucking with me and didn’t want me, so I started giving smart ass responses since there was no reason to let myself get beat up.
I get a call a few hours later telling me I can start any time. I told the recruiter to tell the company that the interviewer was a dick (in nicer words) and I’d pass.
Worse than no feedback is opposite feedback. Don’t play mental games with people.