In the meantime there are some apps that "block" instances. Connect has it, but it doesn't fully block the instance, more like it shows up in the feed with a content warning that the message is from a blocked instance and you can choose to view it if you want. I also do think lemm.ee will defederate from hexbear pretty soon. The admin has had personally horrendous experiences with their users and that meta thread about it was a dumpster fire of hexbear users making unrelated political comments and blocking the actual instance users from having a discussion. It got locked at almost 2000 comments so I'm sure he's still digging through that toxic waste to make his decision.