YouTube Video Recommendations Lead to More Extremist Content for Right-Leaning Users, Researchers Suggest::New research shows that a person’s ideological leaning might affect what videos YouTube’s algorithms recommend to them. For right-leaning users, video recommendations are more likely to come from channels that share political extremism, conspiracy theories and otherwise problematic content.
Thumbs down actually makes Youtube recommend more stuff to you because you’ve engaged with the content. As said by other people, best way to avoid recommendations you don’t want is to just ignore the content and not watch it, if it’s being recommended to you then click the three dots on the video thumbnail and choose “not interested”/“don’t recommend channel”.