Little kids can actually fight, my friend. In fact, if you push them or insult them, they'll just be afraid and run away... But wait...
The respect of the Non-Cliques depends immediately from the respect you have from all the cliques. At a certain part of the story, after you tagged the townhouse, nobody likes Jimmy. This is the moment to try this little trick...
So, impossible to make a little kid fight ? Take your camera, and aim at him, turn around him and insult him with your camera on. This will sometimes anger them enough to... Start fighting !
If you get this, you better let your friends defend you against them - they will get caught by the prefects, hehehe...