That's a clever distinction, but I don't think it's sufficient. It's not clear that, e.g., the Athenian leadership, were "willing recipients" in Socrates' case and so your test would fail.
Further, I think this thread itself is a testament to the murkiness of "willingness" -- are we willingly engaged in a formal spar? We disagree, we're talking, we're debating. If I had thinner skin, I could accuse you of aggression and that would be that. You could do the same.
The "marketplace of ideas" should trump an individual's sensitivities. I will concede that the internet complicates this. Weirdos† -- neo-Nazis, furries, flat-earthers, anti-vaxxers, bronies, hoarders, etc. -- can now find like-minded communities that validate their weird beliefs. The danger is the town square turning into a bunch of silos. Weirdos can often be a good thing for a society if their beliefs are validated in the marketplace. But they can also be a very dangerous thing if they all congregate on 8chan.
† By 'weirdos' I mean those that hold fringe beliefs or partake in fringe activities.
I am not trying to reinvent the notion of discourse, but to say something about the patterns of behavior that are readily observable and functionally comparable to real life interpersonal interactions. Imagine, for example, if I had responded to your initial comment with vile personal slurs or similarly inappropriate behavior and then mocked you for getting angry.
That's why I gave examples of aggression that could be healthy or productive. A football game or a boxing match is an aggressive competition but one in which all participants contend voluntarily. Likewise, a debate or dispute can be quite heated but nevertheless proceed by mutual agreement. I distinguish these from cases where aggression is inflicted upon unwilling recipients.