Hi Cathy

Do you have opportunities to thank him? in my experience the best way to raise someone's awareness of this is reciprocation - at first it may not be sincere, but as they come to see your response to being thanked they think about it more.  

Alternatively do you ever get the chance to comment on someone else's nice manners - in a more conversational way - this avoids causing upset because it is not a comment about him personally.

Good luck

Cathy

ps for all my Boss's faults he has always thanked me for my help and makes sure others know he appreciates it - and I feel free to tell him when he does something I appreciate too.