This post is not only to try finding the best Mastodon instance/server but I also wanted to express about the Mastodon instances.
Most of Mastodon servers are apparently harsh about other instances that include things they don't like and are quite serious about getting those Internet points putting how the place isn't welcome for "bigotry" and is for everyone and so diverse, and I wouldn't have any problems with this if this wasn't frequently used by people who will try to shut you if they disagree enough with you and will try to present themselves as so virtuous.
You'd expect that the free side of the Internet would have people that value freedom and should let anything that isn't a crime or something that prejudice the instance itself or whatever space they're in but it seems this vision is getting far from the reality with time.
The beauty of the Fediverse is that anyone can set up an instance and, if a bunch of Nazis, for example, did that then it needn't be an issue for as, in the normal run of things, I wouldn't just stumble across it, I'd need to seek it out.
Where that Nazi instance would become an issue is if:
Their content is illegal in the country another instance is based in (for example Germany), as anyone subscribing to a community on the Nazi server from another instance is causing that content to be drawn over and displayed in another instance. It happened recently with issues arising from lolicon.
The Nazis decide to stir the hornets nest and start cross-posting objectionable content or just being unpleasant trolls. If an instance becomes known as a hotbed of trolls and bots it is likely to be cut off by the main instance.
Neither example is anyone scoring "Internet points".
Yes, that's the part where I said in most part only illegal content and things that prejudice the instance itself like bots and spam overall should be prohibited.
And that's what usually happens. Almost all the cases of defederation I am aware of have been over bots.
Different instances have different tolerances for things though - my home one has said they'll use defederation sparingly but we'll see what happens when they are properly tested.