ARE YOU KIDDING ME?!

How am I supposed to stay calm when I deal with idiocy like this? A certain non-professor (instructor) who shall remain nameless requires that for each of our writing assignments, we hand in two copies. First of all, I have no idea why that is necessary. Second of all, in a huge rush to finish the assignment on time, I forgot to print out a second copy. As a GESTURE...(I assumed that is all it was because it surely wouldn't be important)....I saw him after class and mentioned that I had forgotten to print a second copy, and could I bring it to his office later or email it to him? He says no. I say, is there a penalty if there is not a second copy? He says, yes, there is a deduction in points. I ask how many...he says 5-7 points. I verify that that is enough to go down from an A to a B..he says that is correct. Oh my gosh, seriously?!!!!! I feel like pulling my hair out: THAT MAKES NO SENSE AT ALL. GRRRRRRRRR. What is the point?! I hate sounding like this, but my GPA better not go down because of a PSYCH class of all things! I understood when I had to give up a 4.0 GPA due to a Statistics class: that was kind of expected, but if it goes down again because of this class, I will be livid.