I’m so glad you wrote this. I’ve been through so many interviews where I was treated like garbage. I’ve wanted to write the same thing. We really need to treat interviewers better. I have to add my own two cents here of what I’ve had too.

Tardiness is a real problem.

I had an interviewer show up an hour late once. She asked me why I had shown up an hour early. I showed her the email she sent, this confirming I had the correct time, she simply said “my bad.”

I had one interview show up 30 minutes late with no apology. This was at a company I already worked at, I was looking for a promotion, and my work day started after the interview. This was her suggestion for the interview time. Because she was so late, my interview ran late, and I was late to my job. When one of my clients came looking for me because I was still in the interview, she told me I had poor boundaries with my clients, and cited this as an example of being unqualified, even though she had caused the situation.

I had one interviewer who was on her cell phone texting during the interview. Her colleague grilled me the entire time, and there was no time for me to ask questions or learn about the company.

I had one interviewer tell me my resume was very impressive and he liked all of my experience and background. He then said “so why aren’t you in graduate school right now? Is there something wrong with you that you haven’t gone yet?” Grad school wasn’t the right option for the life I wanted at that time, but that was not okay with him.

Then there was the interviewer who asked me what I knew about the history and philosophy of the system they were using at that company. I had read a well-known book about the very system because I had found it interesting. When I told her that she said “Really? You read that whole book? That’s a boring book, I had to read it because I work here, but there must be something really wrong with you if you were willing to read that for recreation. I wouldn’t mention that to anyone.” Later on in the interview she also belittled me when I had referenced some of the ideology in the book (after being prompted) and how I liked the way it was applied in the company saying “Wow so you not only read the book, but you paid attention to it, and are now applying that knowledge in context. There really is something wrong with you.”
I left deciding I did not want to work there. I loved the other people at the company, and the company as a whole was great, but I’d have to work directly under her.