Why Didn't He Like Grease?

Raul walked in during the scene where Travolta attempted to play jock in order to please Sandy. Travolta's 'Grease' character came across as a buffoon, a loser when compared to his idol 'Manero.' It enraged him to see 'Tony' portrayed this way.

Nova's theory is interesting. However, he went in without even knowing what the scene was about. I think that he was so obsessed that this mind inmediately dismissed the movie simply because it wasn't S.N.F.