Just because you are staying in a Grill cabin doesn't make you any better than a non-Grill passenger. I witnessed this kind of behaviour in the Priority check-in line last year at Southampton. Although I was a Britannia-grade passenger with my Platinum status I check in with the Diamond status and Grills passengers. While waiting for an agent to become available "Queen's Grill" passengers announced we are Grill and pushed ahead of me and strode to the available agent before the Cunard rep and I could blink. The rep apologized profusely and I said it didn't matter and muttered "Just because you are Grill doesn't make you any better". The rep did not say a word but she gave me a big smile.
The thing I find interesting was that when they were allowed to stay on board, Bernie Warner took away their alcohol. To me that implies that this might be an alcohol-fueled problem.
Sun Princess (2 times), Mississippi Queen, Dawn Princess, Coral Princess (2 times), Regal Princess, Grand Princess, Diamond Princess, Maasdam, QM2 (15 times)