@freemo Mastodon.social has been pretty bad in general. Looking at what and how they ban simply makes me cringe. They are supposed to be advocating the Fediverse, not stifling it. Looking at their blocklist shows that they block those with whom they disagree. They use "harassment" as a blanket term. Well, they never had issues with harassment with some of those instances, because they never federated with them to begin with.
An admin should only block another instance when they actually have problems with that instance, and there is no other way to resolve it.