You can click the three dots beside such videos then select "Don't recommend channel", you won't see these videos in your "Home" section of YouTube. There are a few gurning-in-the-thumbnail types that I've stopped seeing altogether after doing this.

If your issue is that you play a video then just keep watching whatever YT shows you next and it's sometimes this person, then I'm not sure if this solves that problem since I don't do this personally