Is it acceptable to tell your 13 year old step son to f*k off? Now I don't believe this is acceptable but according to my partner they did no wrong!! Admittedly my son did tell them to pss off because they were arguing which I have explained to my son that is not ok! But in my opinion as an ADULT telling a 13 year off to f off is not on! So just want to know if I am overreacting or not??