You literally can't do it. If you try, you just get an error message. Pretty much anything from hexbear.net is unblockable. Which is really unfortunately, because it is one of the worst instances out there.
If you use ublock origin adding the following to the filter list should help.
fedia.io##article.entry:has(aside.meta > a.magazine-inline[href$="@hexbear.netl"])
Is anyone else finding it impossible to block anything from hexbear.net? (fedia.io)
You literally can't do it. If you try, you just get an error message. Pretty much anything from hexbear.net is unblockable. Which is really unfortunately, because it is one of the worst instances out there.