You can mute/block and report on Nostr. It's up for clients to do whatever they want with those reports. For example, on Amethyst, if enough of your follows report someone and block someone, you will automatically block them too. It's part of your Web of Trust.

And this is I feel what needs to be explored and expanded upon. A Web of Trust scores and indicators can be very useful and powerful for users to have positive experiences online. It allows us to build our communities and our networks without groups of trust, just like in real life. 

When it all boils down to it, we're never going to stop people from being assholes. If someone wants to have a corner of Nostr with a few hundred assholes all circle jerking one another, then they can have it. The other 99.99% of the world will be here dominating the space with love and positivity that is fueled by human connections and zaps. 

Zaps are a key part of this puzzle. We're incentivized to be nice, kind, and positive to get zaps. Sure, assholes can zap one another, but in the end there's more of us than them. We are the signal. They're just noise. And our zaps far out weigh theirs.