I'm going to call the cops on a random bar goer
What is this person doing to make you call the cops on them?
He's probably drunk and that's why he's hanging out at this place, there are so many better things to do.
It's a bad idea to call the cops on people who aren't doing anything that warrants it. You could get in trouble from the cops, and they may also stop responding and not be there if something really does happen.
I just want to prove a point and make sure he goes home.
Your concern is in the right place, but you have to be careful that you aren't misreporting people to the police. If they are drunk and try to drive, you should call the cops, but if they aren't let them take care of themselves.