Army- Holden hated the idea of war, and thought of the Army as a place "full of bastards"- His brother served and was apparently negatively affected by it. Hence, Holden says about the War:
"Anyway, I'm sort of glad they've got the atomic bomb invented. If there's ever another war, I'm going to sit right the hell on top of it. I'll volunteer for it, I swear to God I will"
Movies- Of course, Holden hates them too, as he figures that they are phony and even phonier are the people who go and see them and says right on page 2.
"If there’s one thing I hate, it’s the movies. Don’t even mention them to me”
Theatre- He thinks Broadway is "mobbed and messy" and, again he thought Sally was the "queen of phonies" for even liking the theatre-and he thought the same of the actors/actresses on stage.
He did deny moral and social principles- but he denied them to himself- The insistence on hating everything and not turning his social skills for the better simply made him more of an oddity, and he did all that to himself. The world went on as usual. He ended up in a mental institution.
I think he hates them because as big starts they atend to lie a lot , but at the same time they supposed to procted a good image of themself so am sure holder finds that very hipocrital. the second reason it may be is they get all the highlight and he doesnt. lets face it we all wish that could be starts