[throwaway2037]

    > we need to speak honestly about that

No need. Just walk away. Remember: You are interviewing them, just as they are interviewing you. Any company worth its weight will not allow red flags to leak into the interview process, e.g., "getting the vibe that none of the engineers seem to like working here". So many times, I have reached the final round of an interview process, met the senior manager... and thought: "Barf, I don't want to work for that person. What a waste of my time."

[strken]

I know I'm interviewing them. That's why we need to talk.

If they wanted to hire me enough to interview me, but at the end of a half-day of interviewing I'm going to walk away without a job, then they need to rewrite their position description so I know not to apply, deal with their morale problem, or directly ask me how much PL/pgSQL I've done. We both stand to benefit from talking about how the interview went.