If something is overly vulgar or I know they stole another youtubers content then i dislike. Other than that i just leave. I think low retention is a better way to penalize those who make that type of content. Likes and dislikes really don't impact the algorithm that much. So they can still get views. Especially since many people who dislike a video will watch it to the end or more than once. You are actually helping them by doing that.