“Suck it”? Really? I think that at his age, he’s picked that up from someone or something he shouldn’t have had access to. I’d have a chat with his parents. They have to find out where he got this from just to make sure no one is exposing him to things he’s too young to understand. And the violent streak? My first assumption with all of that is that he’s acting out. Someone may be hurting him, and his parents need to find out if that’s happening.