It is rude to yell at someone with a disbaility.
Jerry is forced to be in a wheel chair and accidentally runs over David's toe at a party.
David wants to release his sudden anger.
David turns around and hops away grunting under his breath.
David yells at Jerry and tells him to watch where he's going.
Jerry does not notice that he hurt David and continues his time at the party.
Jerry's feeling are hurt as he is yelled at, and he is sad.