I got the story directly from Dean, the person who was asked to leave. I grilled him for details and he admits he went overboard after he was grabbed by the casino staff. he sweared at the pitboss, which is apparently what Celebrity was most upset about.
He didnt threathen him, he said something about them catering (kissing tush? I don't know) to rich Russians while he was a "nobody?"
I am just being devil's advocate here, saying that if a cruise line ever bears responsibility for someone overimbibing then they should in Dean's case as well. Dean actually pointed out how much alcohol had been served that embarkation night.