Personally, I think what they are saying is reasonable. If I start an instance with a particular goal in mind, whatever that goal may be, then I want users that will support that goal. If a user doesn’t support that goal then they should go find an instance that’s a better fit. That’s part of the beauty of the fediverse. You aren’t constrained to a single instance. Users should find instances that fit them rather than expecting instances to change to accommodate them.