you need to show this guy not to fuck with you
next time he calls you an owl, start running in circles immitating an owl
then look at him with the craziest, scared look of your life
like he was a predator and you are ready to do anything to save your life

then launch yourself at him and hit him on the head with your front teeth
then tell him you were just pecking at him with your beak, since you're an owl