I actually agree with what he did. Shaking hands is a sign of sportsmanship and by no means required. It's a given at the end of the game that you let the clock run out if it's the last possession. North Dakota lacked sportsmanship, so he didn't see the need to reciprocate.
I understand the eye for an eye thinking, but who is he proving a point to? No one. He is the one looking like a dbag again, not ND for playing it out.