Lots of great replies, but I agree that speaking to someone or wasting any more of my time/emotional-energy serves me no purpose. Sure it might be helpful to the restaurant and server to provide feedback, but why does that matter to me?I don't understand the advice to talk to the manager. CO-guy was traveling and was likely never going to return to this restaurant, no matter what.
Also, last year I was staying in a nice downtown hotel while visiting a friend. As an early riser, I had eaten breakfast and was packing up just before 8am when housekeeping ignored the DND sign on the door, knocked and then immediately tried to enter the room. Had it not been for the slide lock and my own loud voice, they would have walked right in. I called the front desk immediately and had the manager meet me in the lobby before departing because it was an obvious safety issue.