He then asked if I was willing to shoot someone over my xbox.
I told him, "The xbox was besides the point. We are talking about a person intruding into my house at night with my family present. Hell yes, I'd shoot him. It's the principle of the thing. I'd shoot a hole in my xbox without blinking to do it."
Of course he did - because they're not actaully having an "debate" with you. Leftists are criminals. You have to recalibrate your expectations and realize you're not dealing with righteous people, but crooks pretending to be righteous and attempting to reverse morality on you, to demoralize you. Just like anyone who argues in favor of CP is probably a pedophile, anyone who argues in favor of theft and robbery likely feels guilty about his participation something related to theft and robbery. Don't let these people con you. They're not playing devil's advocate, they are the devil's henchmen. The best way to deal with them is not to argue in defense of yourself, but cut right to the chase - accuse them of being a thief and/or robber. Tell them loudly you had better not catch them stealing anything. Tell everyone you know that he's a crook and make him defend his retarded position to them.