Then he'd probably ignore alicorn's scornful comment

Yes. It would probably also involve expressing agreement with part of what Alicorn said (ideally part that he could sincerely agree with) and perhaps paraphrasing another part back with an elaboration. That seems to work sometimes.

I don't think gwern's required to turn the other cheek, and you obviously don't think you are so required, either.

No, I don't (where all the negatives add up to agreement with this quote). That is just what would gain the immense respect for social grace (and plain grace).

I don't think gwern's required to turn the other cheek

Someone like you can tell me in all apparent seriousness that Alicorn slapped first, but that doesn't make it so.

Now it may be that her edited comments contained emotional attacks with nonstop profanity, starting before the linked comment. But the record only shows her apologizing and getting the contemptuous line I quoted in response.