Why do people think Silver is such a cool rival?
He physically and mentally abuses you, and possibly his Pokemon to some degree, he possibly sexually harasses you once (when he supposedly yells at you to take off your Rocket uniform) and whines about how "weak" you are even though you beat him, because you care about your Pokemon and think of them as your friends?
Your bratty/cocky rival (Green) and friendly ones (Brendan/May and Pearl) can't be "worse" then him.
Before he gets his Heel Face Turn he's a mega jerk. And not the cool sort of jerk, like Paul from the anime, either.