How do I block all of Hexbear from All?

- sarcasm
  edit: if you dig deeper (and I don't blame you if you don't), you'll find a lot more than just annoying posts over there. It's full of right wing propaganda

if you are using sync, you can filter instances.
other apps do this too, like connect i think.

You can only block individual communities right now, but apps like Sync let you filter instances from your All view.

You can't yet.
https://github.com/LemmyNet/lemmy/pull/3869
Once thats pulled, and the master branch is updated, you should be able to.
- Here's hoping that'll be quick.

use block instance script on violentmonkey.
https://greasyfork.org/en/scripts/469297-block-lemmy-instances
- Can I use Greasemonkey for this? I've used Greasemonkey before, though rarely.
  
  yea yea same. add each instance like this: "instance 1", "instance 2", etc.. in line 17

Join an instance that's defederated is your only real option. Even if you could block the instance you can't block all the users, which is why most of the replies to your post are from hexbear users trolling.
Not sure why your admin decided to not defed despite the toxicity and hate they showed to him.
- I mean, I am in Lemmy.world. Problem is it's always down.
  
  It seems to have improved significantly in the last few weeks, I haven’t had any issues on my world account. Seems a bit faster lately as well

It's called scrolling and/or blocking communities.
The fact that you saw a post and immediately said "I can't deal with this! Get it out of my sight!" but didn't bother to see the solution literally at your finger tips...
Just ignore posts you don't like. If you can't deal with posts you don't like being in your feed, stop browsing All. There are so many solutions to this that don't involve completely dog piling onto people (and other communities) that did not (and don't) post the content you didn't like.
- How does their behavior on their own instance affect everyone? Please enlighten me.

some clients i think have that functionality (not rightly sure which), and i know it is a planned feature for lemmy as a whole eventually, but honestly if you saw one bad post, just downvote and move on, leave a comment on it expressing your distaste, or just block the user, or the community, right? i feel like wanting to block a whole huge instance over one stupid post seems a bit over the top tbh.

Not ideal, but some mobile apps have the feature to filter content (including comments) by instance. Connect for Lemmy has this feature.
- The best app imo

I'm scared of commies but actually it's their fault so they're stupid
- I'm not "a commie", but the way I understand it is that the kinds of "commies" that Russia and China say they are (and also that the US says the two are) are not communists at all.
  
  Biggest whoosh

I am not used to seeing this level of stupid
lol, you don't even know what the term "cryptofascist" means. Every accusation a confession.