Where's the joke?

With this post I just described some people I've met on my journey through fediverse that were saying that they love fediverse meaning by it only Mastodon, as if it's the only platform out there. It's a small number of people, that don't affect anything. Of course after spending more time on fediverse they find out about other platforms(and that's good). The point of the meme is just to make a little fun of them, nothing offensive.

Or Misskey/Firefish