Inappropriate behavior, whatever that is, is not defined by sexual orientation, etc.
If people of the opposite sex kissing are okay, yet people of the same sex kissing are not, YOU are the problem, not them.
There will always be those on the fringe who think there should be more or less allowed. It is not up to an individual or even the Westboro Baptist Church to define what is, or is not appropriate.
If people want Disney, they should cruise on Disney. Carnival is a mass market cruise line and the mass market is full of diversity.
I do agree that smokers smoking in no-smoking areas should be put off the ship.