Clinging bitterly to your priors and your metta sounds like a sign you should update, and that's more important than deleting or not deleting a blog comment.
As for your comment, first two paragraphs are fine, perhaps even providing helpful clarification. The sarcasm in the second paragraph is probably unhelpful, though, maybe just edit the comment.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.