ServiceNow interview questions

Interview consists of 3 rounds. 2 technical and 1 Managerial, didn't got the response yet. I cleared both technical round with good feedback whereas Managerial round was full of negative experience. When I denied to negotiate on CTC manager took a way to pull me down by asking all unnecessary questions that were not even requried for the job role and mentioned requirements. But I didn't lose by cool but he went way rude and unprofessional giving all negative replies moreover no patience to listen to my complete reply for his asked questions. I may have negotiated on CTC if have asked on proper way rather than just pulling down candidate confident. He asked I have "huge area of improvement" if that is the truth how come I cleared 2 tech rounds. Please check with your technical rounds panel and don't waste time of candidates.