What I would consider is that nostr doesn't show you content. The content you see is a function of: 1. The people you follow 2. The relays you read from 3. The clients (apps) you use

I can't think of any clients which surface weird stuff (I've never seen any on nostr). I think to reach this situation a user must follow weird accounts and thus get their content - but then I can't see that as being nostr related, since someone could do that on the internet or other networks.