Pretty sure this guy thinks that rules against holding foreign feudal titles applies to receiving a copy of his vehicle registration... Because they're both called "titles," and of course as a sovereign citizen he counts as a "foreign state".
No Title of Nobility shall be granted by the United States: And no Person holding any Office of Profit or Trust under them, shall, without the Consent of the Congress, accept of any present, Emolument, Office, or Title, of any kind whatever, from any King, Prince, or foreign State.