Comment by derefr

That would imply a slightly different semantics than what the extension currently provides, though.

If you truly want certain users to be "ignored", then you probably want any of their comments (and the subtree of descendant comments) to be hidden/collapsed/made less legible, so that you don't accidentally read them, and thereby don't accidentally get rage-baited by them into wasting your day arguing with them. Same as e.g. kill files on Usenet.

Given that this comment collapsing/hiding/visibility-decreasing is something already built into HN (for comments/subtrees with strongly-negative score), it'd be really easy for the extension to hijack this functionality for its own purposes... if it actually wanted the red button to mean "ignore".

That the extension doesn't do that, implies to me that the extensions intended semantics for "foes" isn't "I don't want to engage with this person" but rather "I want to notice this person more." Perhaps "so that I can take the opportunity to actively antagonize them / argue with everything they say."

(I'm not saying that this is a good thing; just that insofar as "the purpose of a system is what it does", this is the purpose of a plain "foe" signal!)