I wouldn't check for bowel sounds either, sounds ridiculous to me.
If they had bowel surgery, they would most likely be NPO anyway, and immediately after surgery, they wouldn't have bowel sounds anyway.
Sound like the nurse you were giving report too was a bit to big for his britches. Probably insecure with himself, and thought it made him sound more knowledgeable. I've dealt with many like him - we all have.
No worries, just do your job and eventually someone will put him in his place.
I've actually said to nurses, "May I please finish my report and then I will be happy to answer any questions you may have." Most are pretty good about it. Constant questions gets me off track, and I tend to lose my train of thought.