What I don't like about that attitude is that it suggests that the blogpost should be excused from criticism of its rigor. But any assertion and opinion by anyone can and should be considered open to criticism.
> "But no, the author has no responsibility to provide you with a comprehensive list of citations and references."
Of course he is not responsible. But if someone expects or wants people to be convinced of their argument, then prefacing with his rude dismissal does not help.
A better way than "This article was written hastily, and I don’t want to further improve it. You’re lucky I wrote it." without the unnecessary rudeness and ego boosting could be more along your lines: "This article was written hastily and shouldn't be subject to PhD-thesis-level scrutiny, so I've posted without any expectation that I will improve it or respond to criticism."
Sounds to me like you agree with the substance of what the author said, and just happen to disagree with the delivery. Keep in mind that different people have different writing styles, and people often post things like what you quoted in a tongue-in-cheek manner. Some people prefer a formal, humble style of writing. Others like a more humorous style, and others yet enjoy a Steven Colbert faux-braggadocious style. It would be unfortunate if we browbeat anyone who dares to inject some quirky humor into their writing.
The author makes a bunch of assertions that range from misinformed to straight-up wrong. There is 0% Steven Colbert-style self awareness. No one is lucky that it exists. When you engage in personal endeavors, do them for their own merits. And especially if you're doing something that no one and nothing is compelling you to, please at least try.