While this might work it is not suggested by the police. We were taught this when I work in the police dept, never confront them leave to the people that can put them custody if called for. Yes they can see you but you are putting yourself at risk. This is my view only. I just saying with the way people act these days you never know if they are just drunk or high on something.
I think you may have misunderstood. I don't "confront" the group and I don't go out of the safety zone of my doorway. And I don't yell or holler at them. I just get their attention with an "excuse me?" and then tell them the time and that there are people who are trying to sleep. In every instance, I have been answered with an apology and things have quieted down. I have never asked someone to stop what they are doing, just to keep it quieter. They are on vacation too.