You still can set your page to private if i am not mistaken. And you are also not forced to use facebook in the first place. I understand that its unpleasant and annoying in public, but the assumption that someone elses free speech in a public place affects you personally whether you want it or not doesnt seem necessary true to me.
While not so well worded, i do agree with the broad rational, that in order to restrict free speech in public, some sort decision has to be made about what is allowed and what not. Like it is with everything from laws to social norms. The methods for decision making are broad, from authoritarian, to economical, over technical to consensus based decision making. But they are all methods of decision making. Asking who, or better how that decision is made is a sensible concern.
There are two people needed for a conversation in a public place. You have the ability to leave. You are not forced to listen to anyone. In a private context this is another topic altogether. You can kick someone out of your facebook group, unfriend him or block him. If they then show up at your front door we are talking harassment not free speech. Which is why the loophole of anti abortion protestors being allowed in the streets in front of clinics is such a horrible situation.
I know its annoying to be confronted with stuff you dont like, when your private life takes place in alot of public places, but that is your choice. You dont have to have a public facebook profile, you dont have to have a public youtube channel. And facebook and youtube as a whole dont have to be a public place if they decided otherwise.