Interviewers making the candidate nervous and asking stupid questions are highly unprofessional
Job Interviewers think they are some bigshots with their BS Questions. And with making a candidate nervous. Oh you think you are really smart asking these question and acting all unsettling huh? No you are really stupid and unprofessional.
You are in the power position. Of course the poor guy applying to the job is nervous if you machine gun him with BS Question after BS Question. "Pushing a candidate" in order to see how he reacts in an artificial unnatural environment, gives you exactly 0 usable data about him
It gives the interviewer power over another person, and for a short time they get to feel like the smartest person in the room as they fool candidates with a bunch of dumb gotcha questions they already know the answer to.
They all turn hiring process in to interrogations and psychological or psychiatric evaluation rather checking if skill set align with the company target. Most of the time is just a Grotesque burlesque.