The original post is a blog post that somebody put into their blog. Its purpose isn't (necesaarily) to engage into a discussion or even interact with anybody. It's the root of a discussion tree, if you will, a place to make a bold statement or just express a random thought.

In contrast, the post I replied to is a response, which by definition (and purpose of this forum) is meant to contribute to a discussion. It's an inner node of a discussion tree and thereby needs to engage with the presented argument.

So, this is an apples-vs-oranges situation, not a double-standards situation.