Not the question itself, the attitude was the problem.

I didn't solve the problem that they gave me, and struggled for a while (I ended up solving it an hour after the interview).

Their attitude was that they were both sitting on their computers working and not paying attention to me.

That was disrespectful and stupid. Interviews are also about figuring out whether you can work with the person being interviewed, not just their tech chops. They completely missed the opportunity.

I went to round 2 which was the same. Didn't go for round 3.