i am not defending him, there is no excuse to hit her but i suspect theres a bit more to the story...
kind of sounds to me like she may have shoved or dragged the kid out the way - she must have, to move him quickly enough to move him from the path of a moving scooter - instead of stopping and waiting for the child to move, saying excuse me to the father, or going round them...
i have been barged by people in these scooters a few times...
he is clearly scum for hitting her, but you cant just barge people away, just because they are little...if someone grabbed my child and shoved them i'd be furious too...
it just seems a very over the top reaction to something if it happened exactly as innocently as she states...