I've seen interviewers that were worse than the candidate, knew less, made mistakes in asking questions and evaluating the answer and then rejected the candidat

I've seen interviewers that were worse than the candidate, knew less, made mistakes in asking questions and evaluating the answer and then rejected the candidate anyway. To get an email like from the OP after something like this would be pretty terrible. Recruiting personnel in human resources are not in a position to evaluate the merits of the interview and it might help if this person wrote the feedback from the perspective of the interviewer and not as a collective "we".