Carnival Cruise Line announced that they changed their policy clothing prohibiting “offensive” clothing, in protection and respect of the passengers aboard, following the response from other travel sectors about passengers displaying messages that others find offensive or threatening.
Accordingly, the Cruise Line advises in its FAQ section that
All guests are expected to ensure their clothing and accessories are respectful to fellow guests. Specifically, items worn during the cruise should not...
https://safety4sea.com/carnival-cruise-bans-offensive-clothing/