Does it really ruin your cruise if you see someone in the dining room dressed in tasteful casual clothing in the dining room on formal nights?
You really think that I'm going to allow some ignoramus or some boor to spoil my cruise???
But the dress code is a major element in setting the ambiance of each evening, be it formal, semiformal, informal, or casual. When I pay for three formal evenings on a two-week cruise, I expect the cruise line to deliver three formal evenings on a two-week cruise -- and that means enforcement of the prescribed standards of dress. If you don't want to conform to the prescribed standards of dress on one line or another, please do both of us a favor and book your cruise on a different line on which the prescribed standards of dress meet your satisfaction. This industry is big enough to provide lines for every set of tastes.