I was taught to give way to the driver overtaking. He is travelling faster than you are so it is more difficult for him to slow down.
On top of that he is clearly less competent than you are as he doesn't know his limitations, so I would rather he was in front where I can easily see him than having him tailgate me, as he almost certainly will until he finally manages to overtake.
Finally, any accident costs you inconvenience and money, even if it is decided that you are completely faultless. With a claim hanging about changing insurance company at renewal can be awkward; you are messing about taking your car to be repaired etc.
Far simpler just to give way.