There is no such thing as "the Nostr firehose", there are only selected relays. And you should never selected these unrestricted relays, and clients shouldn't make it easy or encourage you to do that.

I'm not interested in learning what you're seeing and what tags they use.

We cannot prevent people from publishing bad content on servers they own (or whatever server that accepts it), that's by design. But with that comes also the responsibility of clients and users of selecting carefully what relays they will use when doing this "firehose" activity. This is an aspect of Nostr that is very much underdeveloped, but getting better with clients like https://jumble.social/, https://www.nostur.com/ and https://nos.social/ leading the way.