There is almost never a good reason to be impolite! Sometimes in interviews they try to piss you off with the exact purpose to see how you handle these kind of situation… you clearly failed! My first job after university was for a big tech company… during the interview the interviewer was very aggressive and borderline impolite trying to push me “over the edge”… I handle it with calm and politeness. Needless to say I was offered the job on the spot at the end of the interview (in real life the interviewer was a delightful kind person and all the rudeness was an interviewing technique)