After Jack childishly splits from the original tribe of boys claiming, "I'm not going to play any longer! Not with you!" to Ralph and the others, he redefines his role as leader through his ability to hunt and provide meat. No where is this more evident than the later scene when Jack organizes a feast on the far end of the beach. Ralph actually threatens to use the conch and call a meeting, but Jack rejects the power of the conch by informing Ralph that the "conch doesn't count on this end of the island" (150).
Jack plans to rule without the conch, and in order for this notion to be accepted by the other boys, he must completely reject and undermine the conch's significance and purpose. Jack's rejection of the conch undermines Ralph's authority; the reader can infer Jack's hidden meaning, which is, of course, that he feels that the conch should not count on the other side of the island either. Jack's denial of the conch's significance and purpose showcases yet another way in which Jack has turned his back on another of the more civilized ideals remaining on the island.