I've been at a really bad interview where the interviewer wanted me to sit at a computer, for a limited time, and answer a bunch of mathematical questions with

I've been at a really bad interview where the interviewer wanted me to sit at a computer, for a limited time, and answer a bunch of mathematical questions with the help of writing a program. I was pretty nervous before my interview since it was one of my first ever. I had studied a lot before hand since the company used languages I didn't really know. I could not sleep the night before (mostly for other reasons as well) so I was pretty exhausted when I got there. There was no internet connections on the machine and each question built on the one before so if you failed one you pretty much failed the entire thing. The whole test was a big hit for my imposter plexus and I'm never going to repeat that mistake. I feel like I have the experience and references that I do not need to prove it on a whiteboard. I don't want to and if you require me to, I'm probably not going to work for you. The funny thing is, years later the same interviewer tried to add me on LinkedIn and it felt awesome to ignore that.