Okay...so to everyone whos saying that the parents aren't so bad because they aren't hurting or raping the child, you aren't seeing the big picture.
This is clearly a sign of emotional abuse; they totally crushed his hopes.
And it wasn't like they made the 'joke' and then even tried to console him after seeing his face,they just kept laughing at him.
Any parent that takes joy in seeing their child in pain would be considered the worst of the worst in my book.