Piggy has useful ideas and sees the correct way for the boys to organize themselves. Yet the other boys rarely listen to him and frequently abuse him.Why do you think this is the case?
Piggy is ostracized and ridiculed throughout the novel because of his appearance, physical ailments, and relatively controversial personality. Unlike the other boys, Piggy is overweight, wears glasses, and has asthma. His physique is not intimidating, and he cannot participate in many physical activities. Piggy is also given his unflattering name by Ralph and immediately becomes the object of the boys' humor at the beginning of the novel. Despite his intelligence, Piggy is rather annoying and continually uses Ralph for protection. During the assemblies, Piggy is not afraid to speak his mind and spends the majority of his time arguing with Jack. As the novel progresses, the boys gradually descend further into savagery and begin to follow Jack, which only makes Piggy's situation worse. The majority of the boys favor hunting and swimming, which dramatically conflicts with Piggy's ideas of how their society should function. Towards the end of the novel, Piggy becomes Jack's enemy, and Roger ends up killing him. Overall, Piggy is viewed as a bossy outcast who is physically weak and rather annoying.
All you have to know to answer this question is what Piggy looks like and acts like and how kids treat people who are like that.
I would say that two of the things that kids make fun of the most are kids who are fat and/or clumsy and kids who are smart and don't know how to act "normal." Piggy fits both of those categories.
We know Piggy is fat and we know he has asthma and needs glasses. So he is likely to be somewhat unpopular based on those things. At the same time, he does not have many social graces -- he doesn't know how to make people feel at ease with him.
So that is why he gets bullied -- he is physically unattractive and he does not come across well.
There are several reasons that the other boys rarely listen to, and frequently abuse, Piggy. First, Piggy lacks what a necessary trait in any successful leader: charisma. He is socially awkward, and he has a hard time fitting in with the other boys his age. The boys have a hard time seeing anyone other than an overweight boy with big "specs". Piggy is also intellectually superior to the other boys. He has the rationale of an adult and is easily able to see the difference between what the boys should be doing and what they shouldn't be doing.