Intel Corporation Interview Question

I reversed a string. They questioned on basic object-oriented design. Gave me a basic situation and asked for me to design an overall class diagram of objects and functions I would need. One interview asked me a difficult SQL question at the beginning, I wasn't able to answer correctly. They then said they were done because the next questions were harder and left the room, was extremely rude. Still got the job though, I never had to work with that person thankfully.