Bully

You're so bad says Jacob to Jack. Jack is great at sports.  So great that is better than Jacob.
That is why Jacob puts Jack down all the time.  Everyday and P.E. class Jacob Bullies Jack.
Sometimes it's because Jack makes mistakes,  
But other times it is because Jack is so much better than Jacob.
Some of the comments that Jacob says to Jack are-

“You're bad”, “ Sit down! “,  “You can't play”. One day in P.E. class they were playing basketball.  

Jack had the ball and Jacob was defending them.
And all of a sudden Jack  bounces the ball off Jacob's head and shoots it.
Jacob are standing beside him with his first flying right at him.