I am not a fan of reaching for defederation often; I actually came here from beehaw because I felt like they just pulled that trigger too fast and too frequently.
However, I do think that we should defederate from exploding-heads and hexbear. I don’t go looking for chances to be offended, but I do notice that when I see something truly distasteful on All it is almost exclusively from one of those two lately, and at this point removing them from All would make my lemmy experience just a bit more friendly.
It’s not even worth reporting content about them because when you do it seems like a common theme is that they just tag you so they can harass you. I tested this myself recently by reporting obvious misinformation/propaganda and the next time I logged in there were indeed items waiting in my inbox calling me a coward, etc.
Edit: fun fact, even if you block a user, and you block the community they are posting from, any time they mention you in a post you still get a message in your inbox, which seems like a pretty ridiculous oversight and a tool for harassment.