I've long made a pact with myself: the moment an interview process includes a whiteboard part, I walk out and tell them it's because of the whiteboard. At this point they either want me enough to hire me anyway or it is a better outcome for both parties when I don't work there.
The people in charge of the interview process may well not represent the rest of the company or its culture. At at least one place where I worked, the interviews were done by tech-savvy senior management without involving any of the day-to-day development team at all, which resulted in us employing a lot of people who never lasted their probationary period.
In the trenches, it was still a good team to work for :)
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