You should have told them to take a picture it lasts longer. 😁
March 2017, we were on RCs Jewel Of The Seas. It was the third night, second leg of our B2B Caribbean cruise. We decided to dress formally on a suggested casual dress evening. My wife's idea. As we were entering the MDR for MTD reservation I heard a loud mouth lady (I use the term lady loosely) behind us say, "I guess they didn't read that paper thing in our cabin telling us what we have to wear tonight". I spun around look down at both her and her husband (or whoever he was) and said, “no I didn't read the Cruise Compass in your cabin. What did it say"?! They both just stood there like slugs. I then gave both of them a big smile while shaking my head, turned around. After my wife and I were seated, ordered our wine, made a toast to each other and my wife also added she was so thankful I didn’t drop the F-bomb on them we both had a good laugh and enjoyed our meal.
We no longer take formal wear and not because of that incident. We don't let others intimidate us. I wear Polo/golf style shirts and dockers in the MDR in the evening (except the first evening I always wear shorts and a polo/golf style shirt) and my wife wears slacks and fancy tops.