We all make judgement from our experiences, granted. I am basing my judgement off my experiences. On my last carnival ship (granted, that was 10 years ago and a Caribbean cruise), during the welcome / into the cruise director told us "There are three things you need to know when you are on a carnival cruise. [skip] The second is you don't sleep on this ship. If you want to lie in the sun and sleep, there are a lot cheaper hotels back on the main land. Sleep when you get home. This trip costs too much to sleep. We are here to have fun (queue lots of cheering)." And honestly that was the attitude of the ship. It was loud at night. I was 2 decks down and could hear music till pretty late, and people running up and down the hallways shouting to each other at 2am. Not saying kids don't run on Disney ships - but not usually at 2am from the ones I have been on.
Again - that's probably not all cruises or all ships. However, in my personal experiences, the carnival ships I was on were tailored to party goers, and they didn't hide that fact - they were proud of it. This was never in dispute for Carnival - it was in fact the demographic they were aiming at. My father wrote a couple of books with Bob Dickinson (previous CEO of Carnival) and used to handle their advertising for a while. They made no beef of their demographic and the ads were tailored specifically for young adults. They used to ask me about ads they were working on and even took me on a ship or two.
Now they have done a lot to try to change their corporate image, true. Since about 2006 they did a 180 on their ads with this in mind.
However, I tend to hold grudges.

Once I have a view of a company, it takes a LOT - and usually personal experience which I don't give a lot of opportunity for - to change my world view of that company. Yes - I agree I am obstinate.
[Edit] For the record, my father who was definitely not a "party-goer" was a big fan of both Carnival and
Royal Caribbean for most of his life. Besides writing a number of books, he worked with Carnival to make some classes which he would teach to Carnival executives about "cruise ship hospitality". Were he here, he would probably tell me of various attempts they made to change that image. It's fair to say we didn't agree on everything.