Why does Piggy get no respect from the others?

He is a fat boy, has asthma and tends to whine in a way that makes him a target to pick on for the boys.

Willam Golding uses piggy to satire the appearances vs reality since piggy is presented as a weakling who doesn't seem to work and he is also sickly with asthma.but in reality piggy is portray one who possesses the true qualities of a leader as he possesses brains with Ralph lacks and relies on piggy who helps him