I wouldn't be surprised that Bobby has a pleasant demeanour in real life, but ElComradio's point is also valid. The nerds, when they harbour resentment against the jocks, are playing the same power game as the jocks ... and as such are, ultimately, no better than the jocks themselves (except for the jocks being more successful). As Eric Fromm said: "There is perhaps no phenomenon which contains so much destructive feeling as 'moral indignation,' which permits envy or hate to be acted out under the guise of virtue."
