He makes a big post about how you should host your own instance for the health of the fedi and how he offers hosting services if you need help doing it every time his site gets an influx of users, and we all know he doesn't give a shit about the health of the fedi given how much he defederates over hurt feelings and criticism.
Discussion
Yeah it's just a "cute" way of saying I don't want you in my community, go make your own and never talk to me ever.
He said something like "if you have doubts about how I handle user data you should leave."
Not sarcastic I guess but he wasn't telling josh to leave as much as trying to shut down the conversation because he was mad josh made a good point.