[tomsthumb]

> ... if they allowed me to mark things I'm not interested in and never show me those things again

You can literally do exactly that. If you hover over a title there should be a button that says "Not Interested". It should appear just below the stars as if you were going to provide a rating.

[humanrebar]

I primarily interact with Netflix through my game console. 'Not Interested' is not an option in that UI.