Do you know where he would be heading? If so a call to see that he has made it and maybe ask if they would take the keys from him.
Calling the police....If it was someone you didn't know and knew they were driving drunk...would you call?
Some will say...Hands off.
I say...do what you feel you need do for your own peace of mind.
As to the rude things he said...need remember...He is drunk. His words were just words. Do not take them personal.