The barrier between the two characters begins when Jack starts caring more about hunting than anything else. Jack is more of the chaotic type. He doesn't care for others as much. On the other hand, Ralph is much calmer. He cares more about others than himself. It is the characters opposite personalities that causes this "barrier".
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The conflict between Ralph and Jack is directly an example of Reason Vs. Savagery or Superego (knowledgeable) Ralph Vs. Id (apart of your mind that is selfish and wants everything now) Jack.
jack takes the hunters and creates their own"tribe".
Ralph and Jack never liked each other. Once they met and Jack wanted to take the power from Ralph there was instant friction between the two. It's was obviously Ralph's job to be chief and Jack just expected to get it instead of Ralph.
It's so thickly coated with irony, Ralph's plan throughout the entire book is to keep a fire going to be rescued, Jack could care less. Also, Jack wanted to flush out the island with fire just to finish Ralph off, when instead it brings rescue to Ralph.
Ralph is elected chief during the very first meeting, which happens very early in the book.