When you use a phrase like "genocidal rhetoric", I assume that you consider certain comments to be wrong and bad. From that perspective your question could be generalized to "what's the best way to respond to wrong and bad comments on this site?" Keeping in mind that "bad" here doesn't just mean the comment is badly written—in internet jargon, it means the commenter is bad.
Curiosity doesn't exclude wrongness or badness—it's interested in it. How did this comment (or person) get so wrong and bad? Could that change? Is there a response that could pull them out of wrongness and badness into rightness and goodness? Why do most of my (<-- I mean any of us, of course) attempts to do this fail so badly? Is there a more effective way to respond? Might there be something interesting here beyond wrongness and badness?
That's the spirit we're trying for on this site, so that's the answer to your question.
If I ask myself what other approaches are possible, there's one obvious option, and that is to crush/destroy/defeat the wrong and bad argument (and person) utterly. This is the desire to kill the other person (if only metaphorically (and maybe not always so metaphorically)), and thus establish rightness and goodness over wrongness and badness.
So the "accepted way" here is to listen to the other and dance with them, rather than killing them (or their position). Dance rather than war, if you like.
Is there a third option? I'm not sure. When I look inside myself, I can find the listen/dance option (or one could say give-and-take), and I can find the kill option. But I'm not sure I can find a third.
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Edit: reading this the next day, I think the word 'dance' could have trivializing associations (e.g. let's just dance rather than deal with violence and tragedy). I don't mean it that way. I mean something like moving and changing in response to each other. If anyone can do that in response to the other, even just a little, then one's self becomes a place for at least a modicum of change.