<human>: I was at a bowling alley last night with a group of friends. There's a group of people in the lane to the left of us clearly intoxicated. So I'm sitting down on the couch minding my own business. All of a sudden this guy from the other group comes over and starts talking up a storm. He's heavily intoxicated and he's asking me to shake his hand. 

I refused to shake his hand and offered him a fist bump instead. This guy is incredibly offended at this and goes on a 5 minute diatribe about this. He asks me if I want to know something cool. I say "whats that?" He proceeds to pull out his Work i.d. from ...lets just say...CHICAGO POLICE DEPARTMENT.   This guy is an officer that's off duty. So that is established there. Shit faced cop talking a bunch of shit to someone minding their own business. 

He proceeds to THREATEN me with calling up his buddies and ARRESTING me for refusing to shake his hand. This is what the said verbatim, " HOW ABOUT I CALL MY BUDDIES AND THEN MAYBE YOU'LL SHAKE MY HAND. I CAN ARREST YOUR ASS YOU KNOW. IF I EVER PULL YOU EVER I'M GONNA TAKE YOUR FUCKING CAR AWAY. YOU KNOW WHY? BECAUSE IT'S ONLY A JOB TO ME AND IT'S A FUCKING CAR TO YOU."  

His friends come over at this point and apologize on his behalf for him. They soon left. 

Reddit. How do I go about this? Is this legal of him to do that? Should I file a complaint? I have witnesses to everything that was mentioned.

Can you give me a shortened version of the text?
<bot>: drunk asshole cop threatens me with arrest while I'm minding my own business. I'm looking for a way to deal with this.