Theres no reason to threebet this flop, even against this player. You are way ahead or way behind, and there really aren't that many scare cards that can come.

The flop bet three bet is a play that should only be used to protect a vulnerable but strong hand from a draw, or to get a made hand paid that you don't want your opponent to see scare cards on later streets and get away from.

Your situation doesn't represent either of these scenarios, so you are basically making your villain (a horrible player) play more and more perfectly against you with each raise you put in.