Regarding your experience with the condescending interviewer: I had a similar experience in my last job-interviewing round, and got really pissed, but tried to

Regarding your experience with the condescending interviewer: I had a similar experience in my last job-interviewing round, and got really pissed, but tried to stay polite and answer the question. This doesn't work though: I spent the whole time distracted, with my mind considering the paradox of a founder having such behavior, and that I'd be using the guy as a mentor. The result: I underperformed on the problem, and got walked out, leaving me feeling like the fool. My new rule (and this goes for general life too): I call people's bad behavior, but not in a judgmental way, but rather to avoid adding a negative dynamic as a kernel to the relationsihp (e.g., in a meeting, I speak up if someone could interpret something poorly, to clarify it, because otherwise some subset of the people will be passive agressive and fume and suffer a downward spiral, rather than speak up themselves). I would have felt so much better about myself if, during that interview, I had said, "You know, this isn't going to work; there is no point spending your time on me anymore." And then walked out.