Complaining that you've been banned for a seemingly innocuous post isn't proof that you deserved to be banned. If the author is telling the full story, the admin(s) of their instance were in the wrong.

And this is a legitimate issue. If new fedi users try out an instance and get banned without warning, they're unlikely to try another instance. I want the fediverse to have a wider array of people and conversations happening, but that can't happen if admins are quick to ban instead of engaging their users.