bad behavior of teenagers. the boy stepped on the cat's tail. but when he was little boy, he loved cats. why did he become

anger angry emotion emotional expression frustrated furious human negative rage scream stress teenager unhappy aggressive annoyed bad drawing fury head male person cartoon face illustration irritated isolated young concept design vector teenage aggression tree bench child kid kids cat pain toys ball cubes boy stepped 039 tail toddler behavior bullies characters being rude offensive teenagers cat's tail but when was little loved cats did become aggressive?