What can you compare about Jack and Piggy?I'm trying to use this quote: If you hate a person, you hate something in him that is part of yourself....

I think Jack and Piggy are almost absolute opposites of
each other.

For example, Jack's ownership of the hunting
brigade demonstrates what might be apparent physical fitness and prowess in him. Piggy
is the absolute opposite. Whereas Jack has no problem removing his clothes to reveal the
inner man, Piggy is ashamed of his apparent fat and
asthma.

Also, Piggy's intellectual ability intimidates
Jack. When Jack fails to become the leader, there is something in him that really
struggles with that, but he does not have the intelligence to thwart the boys' purpose
for choosing Ralph. Piggy thinks through all circumstances and comes to Ralph's right
hand as a sort of advisor. Jack might like to be that person, but he doesn't know how to
communicate with reason and logic the thoughts that are inside of
him.

To apply the quote you cite in your explanation, you
might look at how each character uses their ability to try to seek leadership or at
least approval among the boys. Jack tries to portray how what he is interested in will
provide survival and sustainment for the boys in finding meat. Piggy, likewise, tries to
demonstrate that proper hygiene, developing shelter and seeking to be rescued are keys
to maintaining survival. Piggy and Jack hate the leader in each other because their
leadership styles and motive are different but seek similar
outcomes.

Another part of Jack's character that has nothing
to do with leadership may not only be not disturbing to Piggy but acutally appealing.
The converse may be true too. Consider if there might have been a scene wherein Jack led
the choir in song. Piggy might have thoroughly enjoyed it. He would have enjoyed it
because there was no room to compare himself to Jack. In the field of music, Piggy may
not be gifted.