My words are not based on theory but actual practice: I had videos I didn't like on my YouTube homepage, and I didn't click them, and after a little while they went away. It's as simple as that. My Google News feed is the same way.

Don't click the dislike button, rather don't watch the video at all. (Dislike means this video is bad not this topic is bad.)

The videos on my homepage exactly match the videos I watch. Exactly. They are often boring since I want something new - but I can't complain that YouTube is messing with me in some way. (Same with Google News - sometimes I want something new, and it's not there - it's always the same type of stuff.)

People who have videos that displease them on the homepage are watching those videos, and then complaining. "Guilty pleasures" basically.

That’s not my experience though. They just keep showing up. Maybe they are embedded in articles I’ve viewed or something but I’ve never clicked on them intentionally.