I've too many wacky interview stories to list here, but the first time I came to this same conclusion was when I had an interviewer interrupt me mid-answer to correct my pronunciation of "idempotent" (because I said it in what is apparently a more British fashion). I asked him to repeat himself to see if he'd apologize or brush it off as a tic and he repeated himself with an elevated level of contempt. I declined the offer, that company got bought by McKinsey a year later, and everybody lived happily ever after.