[A.J.Armitage]

You insist that only Judah and Benjamin (and, I would assume, the Levites from the Southern Kingdom) should be called Jews. Well, David was from Judah. Now you're changing your mind?

[DensaMensa]

You insist that only Judah and Benjamin (and, I would assume, the Levites from the Southern
Kingdom) should be called Jews.

No, I don't believe I said that.  But the fact is only members of the Southern Kingdom (which was later called Judea) were ever called Jews (named after Judea), and that was many centuries later when they returned from Babylon.  David was long since dead since he ruled all the Israelites only before they split.