First, welcome to OCDO!
Second, unfortunately in Tennessee the State Constitution says in Article 1 section 26, "
That the citizens of this State have a right to keep and to bear arms for their common defense; but the Legislature shall have power, by law, to regulate the wearing of arms with a view to prevent crime."
In my view, this keeps possession and ownership of firearms as a right, but carry is relegated to a conditional privilege.
My own instructor said something similar, but that it shouldn't be done for tactical reasons, ie being the first targeted. When I pressed him for a single example of it happening in real life, he got agitated and so I let it go so I could finish my course. I think that the lie is repeated until no one even thinks to challenge it and just passes it on as recieved wisdom. I don't really think that most people who spout that have any malicious intent, they just pass on what they heard.