Ive been pulled a couple of times and had a chat and they have always seemed reasonable - but that's only because i'm reasonable and quite placid I guess.
I haven't encountered any when i'm drunk because I don't drink, but i can understand how frustrating it must be to deal with drunken people.
Although i was traveling down a country road during the last lot of very bad snow, and there was a police car in front of me seemingly struggling in the snow.
They put the hazards on and waved me past and I pulled next to them in the Supe and wound my window down with them and said "Wow, the snow is bad down here, how are you finding it?"
"Yeah, ok" and put the window up.
Also the time when I was a witness to a cyclist undertaking me and t-boning the side of a van and knocking himself unconscious.
An off duty policeman attended the scene, and as we were waiting for a ambulance he wasn't very friendly or talkative with me?
Perhaps i'm just a bad conversationalist, but i've never managed to hold down a conversation with a policeman, unless they are one-way talking at me about something they want to be talking about.