Earlier quoted context omitted.
It's federated, each instance would be a subreddit. Don't like a instances because it is run by a deplorable? Don't subscribe to it. Is a deplorable posting deplorable things on the instances you are subscribed to and trying to piss on your pool? Downvote/mute/ban them.
> Don't like a instances because it is run by a deplorable? Don't subscribe to it. How is that different from how Reddit/Voat currently are?
More seriously though, the important thing about ActivityPub is that it removes central points of control. No matter how much you agree/disagree with the governance of Reddit/Facebook/Twitter et caterva, they are just too big for the good of society. Federated systems is one chance to take this power from them and bring to people - if not directly (say, because you don't want the pain of hosting/managing all that crap) at least you can delegate this power to someone closer to you - or at very least to a bigger number of smaller providers who will them have no monopoly and will have to keep your interests first.