The point was that there are indeed differences in behaviour between libraries. Supposedly C-99 standardizes much of this, but Microsoft is not adhering to that standard as it would break a whole lot of Windows code if they did.
I already told him to try his experiment again changing his 2 character field widths to 8... where he would clearly see what happens... But he perists, probably without even trying it.
Now, when he is told in a slightly comedic way that we don't know why some things are different... because we were not privy to the library programmer's decision making... he blows a gasket, with you right behind him.
I'm sorry... but really guys... this is just a little over the top!