Ashamed that you binge-watched all five seasons of "Saved by the Bell"? Don't want Netflix to blow the whistle on you during a Netflix-and-chill session with one of those "Because you like 'Saved by the Bell'" show suggestions? Hey, no problem.
Go to your "My Activity" page, and click the X beside the show you want to hide. Now, nobody will be the wiser. That show won't affect your suggestion algorithm and won't pop up in lists that may give you away.