I dunno...that seems like a bit much to take out of this incident. I think the kid wants to win at Quidditch as much as the next person. Malfoy would certainly like to have his name mean something, but it seems like he's been insecure about that since Year 1 thanks to Harry. If he were really that secure and happy to slide by I don't think he'd care about Harry so much.

I thought it was just supposed to be another ha-ha moment to Malfoy, that his obsession with Harry (which would trump his interest in Quidditch no matter how much he wanted to win) not only made him miss the Snitch but get yelled at by his captain. Plus the very thing that should be keeping Harry from winning ends up helping him, because it distracts the other Seeker. It's a good way of integrating the bludger into the narrative of the game so one thing leads to another.