Comment by perpetualpatzer

Neither of those answers seem at all dishonest. They just skip past the diagnosed cause to focus on the impact.

Maybe the boss being a raging ass is the root cause of the team moving in the wrong direction. But that may be debatable, and knowing that doesn't answer the interviewer's question. The more relevant piece is that you and the director disagree and that you don't want to waste your time working on something you aren't inspired by.