Anything that doesn't align with your values. if you consider smart contract chains to be useless and you don't hear any arguments that challenge your beliefs, that is probably not good for you. You're essentially censoring them on a personal level and encouraging your peers to censor them on a social level.

Note that the Left used to censor the Right leaning people on Twitter on a platform level. You can't do that on Nostr.

Trolls are people that simply make an argument just to annoy you. You can technically make an argument that Earth is flat with clever reasoning. You can then go on making the same argument to all related and unrelated notes by someone who doesn't believe in your argument. That is trolling. I prefer muting them on a personal and social level.