@Baxter Pretty much, yeah
Here at computerfairi.es we've got a list of instances that we choose not to federate with (practical offshoot, you can't talk to people on them, but they also can't harass you)
Also each instance has its own rules, so what's okay on one instance might be not be okay on another
You can see the list of instances we block and the rules here: https://computerfairi.es/about/more