Yeah, you can filter your feed. No one is arguing that. But you can't filter the feed to someone else. That's not how it works. I also don't understand why you have to keep throwing around your supposed credentials when you haven't been able to understand a simple web api concept. If you want Threads not to see you, they need to defederate your server. You don't honestly think this server is posting to information to every other server individually, do you? Those servers grab information and that information is the same for every server that grabs it. It does not publish individual feeds to individual servers. That's ludicrous when you consider the minimum specs for a server.
Your credentials don't mean much when you can't provide any hint of skill to make it mean much.