Treated unfairly on the job?

okay i got fired last wensday when me and my boss's son loaded a truck....we left a skid off the truck an they fired me for it when we both should have been accountable right? and also i seen him quit one day when he got mad because he was being lazy he hit a box flipped everyone off in the workplace and walked out...okay so he went to find a job didnt find one and this was a wensday and he walked back through the doors on monday where else could he do this? no where... an she is not the gm she is just a manager and i think if the gm knew about this he would be mad....