@tokyo_0 That’s how Twitter was until very recently when they required everyone to be logged in to see tweets. That said, Mastodon is a different beast since it is decentralized. You can block or get somebody banned and they can just crest an account somewhere else or even create their own server.
I also admit I don’t understand how people become targeted. I’ve been targeted by alt-right people many of times, but as soon as you stop engaging with them their amoeba like brains don’t get…