Oh I won't turn down the offer, as said, I have no choice and it would be an irrational career move to do so.
The ultra-negative interviewing experience just completely changed the mindset with which I will go into that job. This then got me thinking about the hidden cost of a negative interviewing process.
Sure, but in general all of the big company interviewing processes will convey the similar amounts of dread these days. They are so worried about false positives and have so little concern about false negatives that they push many candidates away simply by not focusing enough on the "why should I work here" part of the interview.