Simon-Kucher Analyst interview questions

Associates came in introduced themselves, then took out a pen and piece of paper and started testing math skills. They became very rude, very quickly. They seemed to be restraining themselves to not insult, but it was very obvious they were getting mad, and kept no composure. I was able to answer some of the questions but at one point they just began interrumpting me and wouldn't let me finish. We mutually ended the interview, seeing as they felt I wasn't appropriate for the position, and I felt I wouldn't be able to work with people like that. It was the end of the day, maybe they were tired. Who knows. Still, I don't believe that's an excuse.