What do you mean you will get a black eye? From a six year old?
Kid is looking for attention even if it's in a negative way and your giving it to him. Is there anyway you can have some one on one with him for play time with something he likes to do?
You do need to talk to his parents, even if they allow the boy to behave in the manner you mentioned...BUT, they may accept it or allow it but you don't have to. Either you can "try" to work with him or you will have no choice but to find a better suited family.
Can you give him time outs when he acts up, placing him in a corner for 5 minutes, having him sit on the couch with NO TV for 10minutes till he will aploize for what he has done or what he may have said - and if he does say he is sorry - make sure he knows what he is sorry about...