It's mean to hurt people.
Alex and Richie are in the playroom, and Richie is playing with the dinosaur toy.
Alex wants to play with the dinosaur.
Alex asks Richie if he could play with the toy, and when Richie says no Alex plays with something else.
Alex pulls the dinosaur toy from Richie and pushes Richie down.
Alex and Richie end up playing with each other and having fun.
Richie starts crying and Alex's dad scolds Alex for hurting Richie.