The reason it sounds easy, is because it is easy.
You cannot control what other people feel or think, so why spend energy trying to do so?
Just give them a "You do you", a quick wave bye-bye, and click that block button - and move on with your life.
This is the entire reason I left facebook, it's filled with one-uppers who want you silenced because you don't agree with their every opinion. Let shitty people be shitty, because trying to change them - you might get some of it on yourself, which is what I see in your posts and comments here....someone argued with you and now you want to control what they're allowed to see and say.
In fact, I believe that I'm done with you. You have taken more of my time than I am willing to give, so - toodles!