To the OP:

Simply based on your comments here on this thread you come across as an educated, intelligent, entitled arse with extremely limited legal knowledge.

Based on what you are saying you were threatened by a waiter. Where are your damages? There is a difference between civil law and criminal law. Which do you attempt to apply here?

Maybe the waiter and GM were rude in your opinion. So what? They have the right to be that way. Just like you have the right to not go back. You are refusing to giving us an objective recount of what happened.

What did you do to provoke the waiter? Did you grab a waitress' butt, who happened to be his girlfriend? I'd threaten to beat you up too, regardless of my position.
What was said in the letter to the GM? Sounds like the letter was quite offensive.

Until you provide a full account, your story is very suspicious and lacks credibility.

However, please update us with your outstanding settlement and feel free to gloat. Assuming you will ever find a lawyer here for this issue.