The instance seems to be mostly right wing trolls. I know defederating is unpopular but I don't think much is to be lost in this case and it can save the mods some headaches.
Edit: the response on exploding-heads.com to my reporting of transphobia. Courtesy of the "second in command"
I don't care for them myself, but unless they're causing problems outside for everyone else, why defederate?
If there are communities you don't want to see, you can block them as they appear.
The argument being that if they aren't blocked at an instance-level, due to how the federation works, those comments could very easily spill over into these threads. Those that do want to participate in good faith would need to create an account with an instance that is federated.
How do you block them? Not a feature on kbin yet as far as I know.
If you'd like to block them here on kbin, go to to their domain page:
https://kbin.social/d/exploding-heads.com
and then click the "cancel" circle/crossout button over in the sidebar next to "subscribe". That'll block the entire domain.