Not so hard to do...
“You know, education, if you make the most of it, you study hard, you do your homework and you make an effort to be smart, you can do well. If you don’t, you get stuck in Iraq.”
Okay, somebody with a lesser GPA didn't "study quite as hard" as the other, eh? Especially since they didn't "do well" like the supposed person who they were insulting, who actually did better than they did....
Hmmm?
You are desperate to believe that what he said somehow makes sense. However it really doesn't, and especially when you compare how the two actually did in the same school.... One studied and did their homework and worked hard and got a better GPA than the other. Who was that?
Your "logic" doesn't match the reality. Nor does the whole, "It was a joke about Bush" excuse.... It just doesn't fit.