Don't click on it. I was cringe scrolling YT the other day and clicked on a Tom MacDonald music video out of morbid curiosity and YT decided from that moment on, I only wanted to see trashy white racist rappers covered in cringy ass tattoos. I had to actually block Old MacDonald before YT would give in and stop showing me that buffoon.
From past experience, even just hovering over a video and letting the preview play for 10-15 seconds is enough to add it to your history as partially watched.
That's good to know because a few that I deleted, I was pretty sure I never actually watched and they showed up on my home page. I must have hovered. I think I might be switching do an Indivious instance full time soon.