Fighting for Grades....Is it Christian?

So, as a grader, you can often be some peoples' not so favorite person. I suppose that comes with the territory. I have discovered that some people will fight viciously over their grades, however, and it has struck me rather odd. My husband and I have for years spent endless hours, all-nighters working on projects while at school and our response is almost undoubtedly, "I could have done better." I don't want to toot my own horn, but when someone responds with "I deserve better...." I am struck with an odd feeling that arrogance and pride are at the root of the issue. Certainly, I have been disappointed when I have spent alot of time studying for something and discovered that I did not give what was asked of me, but I don't ever recall badgering a grader over a grade. Am I missing something? Is this proper Christian behavior? Perhaps there is a good explanation for doing this that I am not seeing because I don't do it. Please help if you find this to be acceptable behavior.