Ralph realised that he had come to accept living in a constant state of dirt as normal. His clothes were dirty and his hair was too longer for his own liking. He realised as he looked at the other boys that while none of them were spectacularly dirty, like boys who had fallen in mud might be, inaccessible areas of their skin was ingrained with dirt.
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Being dirty all the time.
By Chapter 7 of Golding's "The Lord of The Flies" Ralph begins to accept their dirty living conditions on the island as normal. The boys are all dirty, with long hair and filthy by clothes. This acceptance adds to his feelings of despair about them ever being rescued.
Stephen Foster
Golding is trying to say that Ralph is the perfect human--a person who is good-hearted but is not so out-of-touch that he can't relate to normal human behaviors.
Jack wants power and Ralph, as the elected chief, has it. People tend to judge other people by their own motives. So, even when Jack manages to seize power and become chief of his tribe of savages he can't believe that Ralph would be prepared to accept this. He fears that Ralph will act as he would act himself and will eventually regain control. For this reason Jack wants to destroy him. As far as Jack is concerned while Ralph remains alive he will always be a threat to his authority.