That he thinks his hunters are incompetent at what they do and that Ralph is not a proper chief because he talks like piggy.
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Jack says that the conch is meaningless on his end of the island. He makes his own rules and does not consider Ralph a leader.
In chapter one Jack states, "I ought to be chief, becasue I'm chapter chorister and head boy. I can sing C sharp." In chapter eight Jack criticises Ralph's leadership by say "He's not a hunter. He'd neevr have got us meat." Which by implication means that as Jack is a hunter and has got them meat he should be leader.
During the meeting when Jack talks of hunting the beast Ralph describes Jack's hunters as, "boys armed with sticks." Later, during the confrontation at Castle Rock, Ralph calls Jack a Thief.
The narrator does say that at all. To quote directly from chapter 3: Huts on the beach... 'They walked along, two continents of experience and feeling, unable to communicate.' Golding is simply using the term as a metaphore to suggest that Jack and Ralph are far apart in terms of their aims and the things which they find important. He is also indicating that they are unable to communicate their different priorties effectively to each other.
Piggy's motives are to build a peaceful society that focuses on rescue, a lot like what Ralph wants. He does not like Jack and I would say He's highlights are earning respect from the other members of the group.