Most likely, you're probably right, but I'm just giving the OP my 2 cents given his concern is the guy being fired. If he gets fired he gets fired, that's the businesses choice, the OP just has to come to terms if this is now something he's going to want to do again, and again, and again anytime he sees something on FB that is offensive. That is why instead of having a game of conscious crisis, report it to FB and if it's too offensive to fall under "freedom of speech", or it's against ToS FB will suspend his profile. That, and obviously block/unfriend.