Are you familiar with basketball...in basketball if a defensive player is planted in a position and the offensive player runs into him it is charging. Sometimes the defensive player dramatically falls in a way that the referee can't miss the foul.

You need to teach your child how to "take the fall and draw the foul." When he is pushed, he dramatically and loudly falls to the ground and stays there. One, he won't be tempted to push back and two, he draws the attention of the coach and the coach sees that he was the one "fouled" and not the offender. Then he stands up and says he can shake it off.

...reading is pleasure, not just something teachers make you do in school.~B. Cleary