That sounds like a non-trivial technical problem. What someone doesn't want to watch is far too broad, from one of the videos on the liberal profile here, you'

That sounds like a non-trivial technical problem. What someone doesn't want to watch is far too broad, from one of the videos on the liberal profile here, you'd be as likely to be "unrecommended" a right-winger's vlog as the Baby Shark song, unless they're keeping track of far more metrics than I think would be practical even at Google scale.