Why do men hate being wrong so bad?

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I recenlty had a discussion with my fiance' about some homework that my five year old brought hame from school. He was supposed to find 100 of some item, and glue it to a page numbered 1 to 100. Well for some reason my fiance' misunderstood it and said that as long as he had 100 things it did not matter what it was. Well I calmly said no that is not how it is. Well he jumps all over my case, and tells me that I am wrong. I give him a few minutes, and picked up the directions, and read them aloud, turns out I was right after all. So since I was right for the rest of the evening he had a huge old attitude about it, and not just that, but everything else. Why do men hate being wrong? Is it a sense of pride? Do they think we are smarter, not all the time true, than they are? Is it so important to them to be right that they would give almost anything to be right all the time? Do you know anyone like this?