My family and friends drink, as do I, and we are very familiar with bar etiquette and the removal of overly intoxicated patrons. The bar is trying to get the person off their property.
I have witnessed a drunk young woman who had slipped on the dance floor and split her chin open being escorted out a back door and into an alley. I encountered her trying to get back in the front entrance to let her boyfriend know she needed help - they would not allow her in so I helped find him. It was late at night, she was injured and was led to a dark alley and left by herself. It makes no sense to handle something this way. If anything it invites liability.
That said, based on what I’ve read about this case I don’t see anything unusual or egregious in the way Riley and his friends were treated. It is unfortunate that they became separated, but alcohol seems to be the culprit here.