We should wear sunglasses while driving at night too.
That's true. I've encountered it many times. And the worse thing is they make the rear view mirror shine like a diamond thus irritating the eyes. Imagine how worse it will be if it is raining!!!
The best thing to do is stop or slowdown your vehicle when you encounter a vehicle equipped with xenon lights at high beam. Never mind about the other vehicle hooting from behind. Its the best way to save us and the vehicle from these showoffs.