I would prefer a vendor responds publicly rather than request a private message. It's possible that one side was angry, and writing a blog post that makes it on HN will surely get a ton of negative attention. If that's the case, they should have the right to clear anything they'd like. I didn't read it as blame, but explanation.
I think it's good to listen to both sides. But the response from Azure eng can be more professional. Customers have the right to do anything, maybe technically right or wrong. But the original post's attitude is more like blaming and throwing out random tech details, not explanation.
