Do you not dip your mirror? It's there for a reason..This current fad kicked off in the mid 90's and with the police being too busy sticking film in gatso cameras it goes unpunished.
Xenon's are not a problem per se, but I have particular issue with tall vehicles such as the Range Rover and the Porsche Ugly SUV thing. I used to encounter them at night on deserted unlit motorways and have to pull over to let them past before my retina imploded.
Failing that, get auto-dimming mirrors. Mine works a treat.