Agreed that it's a soft skills interview at that point for the interviewee, but I think what OP above may be pointing at is that if you've got a good solution, and your interviewer is getting mad... maybe you as the interviewee are getting culture fit signals from the interviewer?

Wanting the job might be down to you needing money. OK, use the soft skills, and make the interviewer happy. If you don't particularly need the money right now, then evaluate whether you want to work with this interviewer at all.

It's rare that you will be working for that interviewer. Much more likely this is just one of the juniors, one of the team, that you may work "with" but not "for". They still matter, as soft skill, because they will give a thumbs up or down to the boss or to the rest of the committee, and they can make up any reason for it that they want. And do you want the company to offer you the job or not?

But yeah, if you get to interview with the boss and they are a problem for you, then that does matter.

Also you are in a better situation if you get the job offer - they want you -, and let it go because you learned about them - and you don't want them anymore. Get the offer.

I agree. To be blunt, ass-kissing is a soft skill. Whether you choose to deploy that skill really depends on what you're looking for (eg big name companies, high TC, remote work, etc.)

And end of the day, interviews are also a chance for candidates to evaluate the company