Why does Jack refuse to give Piggy meat?

In Chapter 4, the boys miss a chance to be rescued, but Jack and his group of hunters successfully kill a pig. They end up chopping the pig into small bits of meat and roasting it over the fire using branches. Ralph and Piggy are both anxious to eat something other than fruit and Ralph immediately gnaws on the meat as soon as he is given a piece. Piggy then asks, "Aren’t I having none?" (Golding 103). Golding writes that Jack purposely planned on excluding Piggy as a way to assert his power and responds by saying, "You didn’t hunt" (Golding 104). Simon then slides Piggy a piece of meat which upsets Jack. Jack then stands up and begins to announce to the group of boys how he got them all meat. Jack refused to give Piggy a piece of meat as a way to assert his power. Jack is jealous that Ralph is the leader and resents his closest supporter, Piggy. Jack is continually arguing with Piggy and purposely does not give Piggy some meat so that he can hear Piggy beg for it.