Using violence to get back at someone is immature.
Tim insults Al's mother and it hurts Al's feelings alot.
Al wants to get back at Tim.
Al decides to make a clever remark about Tim himself.
Al punches Tim and starts a fight because of the insult.
Everyone laughs at Al's joke and Al is satisfied at the results.
Al and Tim end up fighting and injuring each other over a petty squabble.